Model 387 Schematics (01 of 59) SK30218 A 01
SLEEPER LOAD
CENTER
MEGA FUSES
SCALE 1:2 0
TRAILER LOAD
CENTER
SH
NO.
1) INDEX SYMBOL KEY
2) HARNESS FLOW CHART
3) +12V POWER D ISTRIBUTION
4) NEGATIVE POWER DISTRIBUTION
5) +12V POWER DISTRIBUTION (OPTIONAL DISCONNECT)
6) WIPER/ WASHER
7) HORN
8) MANUAL FAN CONTROL
9) HVAC CUMM INS/CATERPILLAR
10) TURN S IGN A L/STOP /HAZA R DS /AUX TR A ILER
11) REVERSE LAMPS
12) MARKER LAMPS
13) HEAD LAMP/DRL
14) FOG LAMPS
15) FUEL HEATER
16) AIR DRYER
17) INTERFACE MODULE
18) SPOT LAMPS
19) LOAD LAMPS
BRACK ET M O UNT ED/FLUSH M OU NTED /
M UTIPLE /COIL 10 ’
20) FLUORESCENT LAMP SLEEPER
21) FLOOR LAMP
22) ETHER START CATER PILLAR
23) WINDOW LIFT
24) CENTRAL DOOR LOCKS
25) DOOR LAMPS/DOME LAMPS
26) PREMIUM SOUND
27) SLEEPER TOOL BOX LAMPS
28) SLEEPER CLOCK
29) AUX FAN
30) SLEEPER READING LAMPS
31 ) REF RIGERATOR UNIT REFE R
32) SLEEPER POWER ACCE SS OUT LETS
33) SLEEPER FLOOR LAMP
34) SLEEPER HVAC
35) DIGITAL MESSAGE CENTER
36) ABS LOW
37) ABS HI
38) CAB CIGAR LIGHTER PWR COM M
39) SPARE SWITCHES
40) TWO SPEED/INTER/FIFTH WHEEL/DI FF LOCK/PTO
41) LOW COOLANT
42) EATON TOP 2 TRANSMISSION
43) MIRROR CONTROL/HEATER
44) ENGINE BRAKE/CRUISE CONTROL/DI AGNOSTIC
45) RADIO
46) SPARE POWER/SYSTEM SLEEP ER
47) CATERPILLAR CUMMINS ENGINE ECU/TPS/
SPEED SENSOR/INTERUPT/WARNING LAMPS
48) SMC SPEEDO MESS AGE CENT ER
49) DATA LINK
50) CAB SPARE POWER/SYSTEM EXPANSION
51) CB RADIO
52) BACKLIGHTING +12VOLTS
53) NEGATIVE SWITCH LINKS
54) SPLICE LOCATION - DISTRIBUTION
55) SPLICE LOCATION - DISTRIBUTION
56) ASH TRAY
57) CAB/CHASSIS HARNESS LAYO UT
58) SLEEPER HARNESS LAYOUT
59) FUEL HOT LINE
TITLE
SYMBOL/ ABBREVIATION KEY
1) STUD
S1
2) SPL ICE
3) RING TERMIN A L CONNECTORS 3) RING TERMIN A L CONNECTORS
4) NUMBERS EX CIRCU IT DES CRIPTION SUF FIX ALPHA
286 -1 A
FOR CIRCUIT NUMBER FUNCTION SEE SK06520
5) RED S OLID COLORS
RED/BLACK SOLID COLOR WITH STRIPE
S OLID/STRIPE
6) BUSS B AR
7) 1 CO NNE CTOR A PPEARS O N M ULT IPLE SHEETS
8) CLC CHASSIS LOAD CENTER
9) SLPR SLEEPER
10) TRLR TRA ILER
11 ) MU L T I CORE CABLE
12 ) CONTIN UED TO O T HER SH XX
13 ) MOMENTARY CONT ACT
CONTACT
14 ) BUL B
SWITCH
SHEET NUMBER
NA
NA
OPTIONAL EXPAN SION
SLEEPER
CHASSIS
LOAD CENT ER
SCALE 1:20
CAB OPTI ONAL
EXPANSION
(BEHIND GLOVEBOX)
CAB
LOAD CEN TER
(BEHIND GLOVEBOX )
PD8A3417.FRM
Model 387 Schematics (02 of 59) SK30218 A 0 2
BAT +
TRAILER
(HARNESS)
LOAD
CENTER
TRAILER
CABLES
HOOD
(HARNESS)
STOP L/P
(HARNESS)
CHASSIS
(HARNESS)
LOAD
CENTER
CHASSIS
(HARNESS)
SIDE REPEATER
(HARNESS)
ABS (HARNESS)
CAB
COWL
(HARNESS)
ABS (HARNESS)
CHASSIS
ENGINE
(HARNESS)
DASH
ENGINE
HARNESS
MEGA FUSE
ASSY
CAB (PC)
LOAD
CENTER
CAB
(HARNESS)
DATA
LINK
HOTLINE
POWER
W/L BAR
37WAY
DOOR
CONTROL
(HARNESS)
LH DOOR
(HARNESS)
HOTLINE
CHASSIS
(HARNESS)
INSTRUMENTS
(HARNESS)
HEADER
LOAD
LIGHT
(HARNESS)
HOTLINE
CAB
(HARNESS)
SLEEPER (PC)
LOAD
CENTER
SLEEPER
(HARNESS)
HARNESS FLOW CHART
RADIO
HARNESS
MIRROR
GLARE
STOPPER
MESSAG E
CENTER
RH DOOR
(HARNESS)
SMC
(SPEEDO
MESSAGE
CENTER
HARNESS)
PD8b3417.frm
Model 387 Schematics (03 of 59) SK30218 A 0 3
31-1 , RED
ENG9
R
E
D
RED
ENG8
-
+
S
STARTER
B+
ALTERNATOR
G
-
+
-
+
-
+
BATTERIES
D
E
R
,
1
7.5A
LOCATION BATTERY BOX
SH 2
BATTERY DISCONNECT OPTION
BDC-1
239-1 , BLACK
298-1 , ORANGE
BDC-2
B
B
A
A
BDC-4
BDC-3
B
B
A
A
298-4 , ORANGE
239-4 , BLACK
RED
239-1 , BLACK
298-1 , ORANGE
789
3
2B
1
5B
6
4
10
BATTERY
DISCONNECT
SWITCH
239-1 , BLACK
298-1 , ORANGE
239-2 , BLACK
S2
BATTERY
DISCONNECT
SOLENOID
BLACK, 239-3
298-2 , ORANGE
S1
RED (NOT WITH BATTERY DISCONNECT)
86
30
87
85
298-3 , ORANGE
CHASSIS
LOAD CENTER
CAB
LOAD CENTER
SLEEPER
LOAD CENTER
TRAILER
LOAD CENTER
RED
W/L
ORANGE
ORANGE
298-1D ORANGE
ORANGE
1
REAR
BATTERY
BOX ONLY
ORANGE
SLPR28
B-
D+
150A 150A 100 A 100A
ORANGE
CLC8
ORANGE
ORANGE
231
FIREWALL
CAB3
MEGA
FUSES
1, RED
ORANGE
ORANGE
SH 57
TRLR2
OPTIONAL
+12V POWER DISTRIBUTION (OPTIONAL DISCONNECT)
PD8b3417.frm
Model 387 Schematics (04 of 59) SK30218 A 0 4
B+
LH
CHASSIS
RAIL
+
+
+
BATTERIES
LH
CHASSIS
RAIL
TO
TRAILER
RADIATOR
239-2JJ , WHITE
1
BLACK
INTERFACE
NEGATIVE
POWER DISTRIBUTION
G
+
S
BLACK
-
BLACK
-
BLACK
-
239-15G , BLACK
, BLACK
239-1
SH 2
CLC11
TRLR3
BLACK
,
239-1KK
239-3JJ , WHITE SH 9
S1
TRAILER
LOAD CENTER
-
ENG6
STARTER
239-7Q, BLACK
239-17D , BLACK
SH 5
CLC6
CHASSIS12
BLACK
239-1NN
S4
239-2KK
BLACK
S2
239-13G
BLACK
S3
239-9L
BLACK
239-7S, BLACK
S5
239-15H
BLACK
S10
239-16E
BLACK
BLACK
239-14J
S9
239-11J
BLACK
239-10L
TAIL LAMP ASSY
BLACK
D
CHASSIS2
SPARE
CHASSIS5
AXLE
CHASSIS7
AXLE
F
CHASSIS11
A
CHASSIS10
SPARE
239-1F, BLACK
REP1
S1
S2
239-16, BLA CK
239-2MM, BLACK
239-3E, BLACK
SH 53
SH 53
SH 24
SLEEPER
LOAD CENTER
W/L
SH 10
SH 10
ENGINE
239-1MM, BLACK
239-57B, BLACK
239-2LL, BLACK
S2
239-16F
BLACK
SLPR29
CAB
FLOOR
D+
ALTERNATOR
B-
ENG8
, BLACK
239-6R
S1 S2
239-8Q, BLACK
S2
239-4BB, BLACK 239-1JJ , BLACK
BLACK
,
239-1LL
CLC9
FIREWALL STUD
1
1
B
X
1
-
,
B
L
X1-12B, BLACK
, BLACK
JUMPE R
PASSANGER FOOTWELL
SLEEPER FLOOR
ENG11
C
K
SH 36
A
SH 36
J
0
9
1
3
-
C
A
L
,
2
B
CYLINDER HEAD STUD
CLC4 HOOD8
K
JUMPER, BLACK
S1
PD8b3417.frm
Model 387 Schematics (05 of 59) SK30218 A 0 5
SPARE SPARE SPARE
S4
SH 50
CAB PANEL
CAB
LOAD
CENTER
SH 14
304-2B, RED
S2
S2
SPARE
3
15A
15A
SPARE SPARE
WIPER/WASHER
REVERSE LAMPS
239-12, BLA CK
239-13, BLACK
SLEEPER LOAD CENTER
S4
RED
,
FOR SPARE
304
SH 46
25A
RED
CHASSIS LOAD CENTER
20A
304-3D, RED
4
0
-
B
5
E
D
,
R
10A
20A
10A
SH 8, FAN )
SH 13, DRL
29-1A , PURPLE
ENG23
ENG24
A
A
239, BLACK
B
B
A239, BLACK
ENG25
A
B
SH 13SH 13
SPARE
15A
SH 9, A/C CLUTCH
SH 47, ENGINE IGNITION
SH 50
SPARE
SPARE
15A
239, BLACK
CAB LOAD CENTER
15A5A20A
FOG LAMPS
SH 16, AIR DRYER
SH 15, FUEL FILTER
SH 17, INTERFACE MOD ULE SH 17, INTERFACE MOD ULE
WITH OVER CRANK PROTECTION
WITHOUT OVER CRANK PROTECTION
298-1A, ORANGE
ENG22
A
B
-
SPARE
20A
20A
LH HEADLAMP SH 13
RH HEADLAMP SH 13
+
S
STARTER
CAB3
1
40A
SPARE SPARE
SPARE
BLOWER SH 34
HVAC HTR
FA N
SH 11
8-1A, BROWN
TRAILER LOAD CENTER
20A
20A
20A
SPARE
20A
SPARE
20A
SPARE
20A
SPARE
E
G
N
A
R
O
,
1
8
9
2
TRLR2
1
A8-1A, BROWN
242-1B, RED
39-1A, ORANGE/BLUE
3-1A, WHITE
39-2 , ORANGE/BLUE
20-1 , ORN/BLACK
SH 9
SH 9
SH 9
SH 9
SH 11
30A
SH 10
TURN SIGNAL
298-6C, ORANGE
298-3B, ORANGE
30A
30A
SH 12
SH 47
ENGINE STOP
MARKER LAMP S
STOP LAMP, SH 43
, PURPLE
A29-1A
298-2AB, ORANGE
30A
SH 47
SH 47
ENGINE BATTERY
A29-1, PURPLE
, PURPLE
A29-2
SH 22
286-2A, RED
86
30
87A
87
85
304-1C, RED
239-12J, BLACK
239-12, BLACK
12-1 , ORANGE
IGNITION
SWITCH
15A
SH 22
EITHER
IGNITION
SH 10
30A
50A
286-1B, RED
BLACK/ORANGE
SH 47
30-1A,
ENGINE BATTERY
ENGINE BATTERY
87A
START
RED286-2, RED
286-1,
29-1 , PURPLE
B522-1 , RED/BLACK
1
0
3
6
2
86
30
87
85
+12V POWER
AND ST AR T I N G
226-5D,
SH 34
PD8b3417.frm
Model 387 Schematics (06 of 59) SK30218 A 0 6
SH5
402-1 , RED/YELLOW
S1
239-4 , BLACK
404-1 , LtBLUE/YELLOW
239-1 , BLACK
397-1 , RED
398-1 , RED/BLUE
403-1 , RED/BLACK
239-2 , BLACK
1
P
1
FW2
FW3
W
M
FW5
7
3
5
2
4
A
E
R
W
I
P
O
M
S
H
E
R
O
O
T
M
O
T
R
R
397-1A, RED
397-3A, RED
S7
397-2A, RED
CAB10
7 65432
, RED/BLUE
398-1A
, RED
, RED/BLUE
397-1B
398-1B
W
O
E
L
L
U
L
E
B
Y
/
/
K
D
D
D
C
E
E
E
A
R
R
R
L
B
,
,
,
,
B
B
B
7
1
1
1
4
-
-
-
-
8
7
2
9
9
9
0
3
3
3
4
2
397-3 , RED
1234
WIPER/WASH
SWITCH
CLC12
239-16, BLACK
404-1A, LtBLUE/YELLOW
402-1A, RED/YELLOW
403-1A, RED/BLACK
RED/BLACK
RED/YELLOW
,
403-1B ,
402-1B
404-1B, LtBLUE/YELLOW
S1
403-1B, RED/BLACK
4312
CAB9
S2
WIPER/WASHER
PD8b3417.frm
Model 387 Schematics (07 of 59) SK30218 A 0 7
PINK/BLACK
243-1B ,
243-1B , PINK/BLACK
PINK/BLACK
A243-1 ,
CAB40
1
FIREWALL
CAB LOAD
CENTER
FIREWALL
STEERING COLUMN
OEM HARNESS
11
243-1A , PINK/BLAC K
CLC12
1
FW6
243-1 , PINK/BLACK
239-3CC, BLACK
B
A
HORN
S1
HORN
PD8b3417.frm
Model 387 Schematics (08 of 59) SK30218 A 0 8
CUMMINS
NOTE: FAN SHOWN IN "ON" CONDITION
A
239-5 , BLACK
B
220-1 , WHITE/LtGREEN
FW4
FAN
SOLENOID
CATERPILLAR
NOTE: FAN SHOWN IN "ON" CONDITION
FAN
SOLENOID
S1
A
239-5U , BLACK
B
220-1B , WHITE/LtGREEN
FW4-A
8
220-1A , WHITE/LtGREEN
CLC12
S1
1
2
BLACK/GREEN
,
B646-1A
1
2
SH 5
, RED
226-1
3
ENGINE
FAN
4
5
A522-1 , GREEN/WHITE
A220-1 , WHITE/LtGREEN
522-1A , WHITE/GREEN
522-1 , WHITE/GREEN
B646-1 , BLACK /GREEN
SH 5
RED
226-1M,
3
ENGINE
4
5
FAN
A522-1B, GREEN/WHITE
A220-1C, WHITE/LtGREEN
522-1C , WHITE/GREEN
A522-1A , GREEN/W HITE
A220-1A, WHITE/GREEN
522-1B , WHITE/GREEN
13
OEM HARNESS
12
A522-1C, GREEN/WHITE
A220-1D, WHITE/GREEN
522-1E , WHITE/GREEN
239-25 , BLACK
253-7 , LtBLUE
13
CUMMINS
12
ECU
2B
5B
789
7
2B
5B
3
MANUAL
1
FAN
SWITCH
6
4
10
SH 53
SH 52
9
3
MANUAL
1
FAN
SWITCH
6
4
10
8
MANUAL FAN CONTROL
220-1C, WHITE/LtGREEN
522-1D , WITE/GREEN
239-10C , BLACKB646-1B, BLACK/GREEN
S2
239-25C , BLACK
253-7B , LtBLUE
CATERPILLAR
ECU
SH 53
SH 52
PD8b3417.frm
Model 387 Schematics (09 of 59) SK30218 A 0 9
A
B
,
LtGREE N/W HITE
93-1B
HVAC
UNIT
C
180-1 , YELLOW/WHITE
D
180-1 , YELLOW/WHITE
E
570-3 , YELLOW/WHITE
F
CAB51
D
634-1 , WHITE
B
239-59 , BLACK
A
152-1 , RED/YELLOW
C
342-3 , YELLOW/WHITE
E
629-2 , BLUE
F
634-2 , WHITE
G
629-1 , BLUE
H
CAB50
A
45-1 , LtBLUE/BLACK
D
212-1 , RED/GREEN
C
240-1 , LtGREEN/WHITE
B
153-1 , RED/BLUE
CAB49
S13
S16
342-5 , YELLOW/WHITE
TEMP-1, GRAY/BLACK
239-59 , BLACK
342-1 , YELLOW/WHITE
239-62 , BLACK
239-60 , BLACK
239-58 , BLACK
A248-1 , RED/BLACK
253-24 , LtBLUE
570-4 , YELLOW/WHITE
CAB58
A
TEMP
SENSOR
B
HVAC
LOAD CE N T ER
CAB
SLEEPER
A/C PRESSURE
A/C PRESSURE
8
8
SLPR
SWITCH
SWITCH
COMPRESSOR
A
B
ENG14-A
B
A220-1B, WHITE/LtGREEN
A
A646-1 , LtGREE N
ENG14
B
93-1A, LtGREEN/W H ITE
A
ENG15
A/C
457-3 , BLACK
A220-1E, WHITE/LtGREEN
239-6S , BLACK
SH 34
17
18
OEM HARNESS
S2
B93-2, LtGREEN /W HITE
B93-1 , LtGREEN/WH ITE
1
3
A/C CLUTCH
4
5
A629-1, BLUE/BLACK
A634-1 , WHITE/BLACK
570-5 , YELLOW/WHITE
239-60 , BLACK
TEMP-1, GRAY/BLACK
342-4 , YELLOW/WHITE
634-2 , WHITE
629-1 , BLUE
93-1B, LtGREEN/WHITE
45-1
,
LtBLUE/BLACK
A629-1 , BLUE/BLACK
570-2 , YELLOW/WHITE
239-62 , BLACK
A248-1 , RED/BLACK
DCBA
CAB46
342-2 , YELLOW/WHITE
152-1 , RED/YELLOW
A634-1 , WHITE/BLACK
634-1 , WHITE
253-24 , LtBLUE
629-2 , BLUE
239-58 , BLACK
570-5 , YELLOW/WHITE
CAB48
HGFEDCBA
212-1 , RED/GREEN
DCBA
CAB47
239-57 , BLACK
240-1 , LtGREEN/WHITE
153-1 , RED/BLUE
SH 4
G
F
H
D
C
E
B
A
CAB52
HVAC
MODULE
A93 -1, LtGR EEN/WHITE
45-1A, LtBLUE/BLACK
2
CATERPILLAR
ECU
17
CUMMINS
ECU
18
SH 5 SH 5
93-1, LtGR EEN/W H IT E
HVAC CONTROLLER
HVAC CU MM INS/CATERPILLAR
PD8b3417.frm
Model 387 Schematics (10 of 59) SK30218 A 1 0
D
TURN
SIGNAL
C
SWITCH
B
A
CAB8
A
HAZARD
SWITCH
281-1 , WHITE
B
CAB6
85-3 86-3
FLASHER
UNIT
87-3
227-2 , GREEN/BLACK
228-2 , YELLOW/BLACK
E
U
L
B
/
E
G
N
A
R
O
,
1
9
3
A
37-1 , GREEN
38-1 , YELLOW
227-1 , GREEN/BLACK
228-1 , YELLOW/BLACK
281-1 , WHITE
39-1 , ORANGE/BLUE
CAB PANEL
CAB
24
LOAD
CENTER
14
LIGHT BAR
CAB PANEL
37-1A , GREEN
38-1A, YELLOW
227-2A, GREEN/BLACK
228-2A, YELLOW/BLACK
281-1A, WHITE
39-1B, ORANGE/BLUE
SH 5
10
WARNING
LAMP
1
BAR
SH 5
SH 47
SH 5
WHITE
ORANGE/BLUE
,
, W HITE
39-2
3-1
A281-2,
SH 5
SH 5
SH 5
, WHITE
3-1A
3-2 , WHITE
86
30
S6
S5
STOP LAMP
87A
87
85
A281-2 , WHITE
SH 5
TRAILER LOAD CEN T ER
242-1B, RED
ACC
286-1B, RED
39-1A, ORANGE/BLUE
86
85
TURN SIGNAL
86
85
STOP LAMP
86
85
239-3 , WHITE
30
87A
87
30
87A
87
30
87A
87
SH 4
WHITE
,
239-4A
BLUE
AUX ,
239-5A, WHITE239-6 , WHITE
A227-1, GREEN
279-1 , RED
A228-1, YELLOW
TO TRAILER
INTERFACE
RH
FRONT
TURN
SIGNAL
LH
FRONT
TURN
SIGNAL
GREEN
GREEN
WHITE
227-4 , GREEN/BLACK
228-4 , YELLOW/BLACK
281-2 ,
227-1E , GREEN/BLACK
281-1B, YELLOW/BLACK
228-1E, YELLOW/BLACK
, WHITE
227-1B , GREEN/BLACK
A281-1
228-1A, YELLOW/BLACK
227-1A, GREEN/BLACK
228-1B, YELLOW/BLACK
227-3 , GREEN/BLACK
B
A
A281-1A, WHITE
A
B
239-11A , BLACK
HOOD14
STP1
E
K
T
I
C
H
A
L
W
B
,
,
B
A
1
-
1
-
1
9
8
3
2
2
A
AB
STP2
STOP
LAMP
SWITCH
S1
TURN SIGNAL/STOP/HAZARD/AUX TRAILER
228-3 , YELLOW/BLACK
2
2
4
4
9
9
10
10
228-1D, YELLOW/BLACK
CHASS1
CLC3
37-1B, GREEN
38-1B, YELLOW
227-1D , GREEN/BLACK
TURN SIGNAL
RH
REAR TURN
SIGNAL
TLJ1-B
C
D
239-1KL , BLACK
B
A
228-1C, YELLOW/BLACK
REP1
86
30
87A
87
85
37A, BLACK
239-4X, BLACK
239-7 , WHITE
TLJ2-B
S4
S2
239-2C, BLACK227-1C, GREEN/BLACK
REAR TURN
SIGNAL
C
239-3A, BLACK
SH 12
LH
B
C
REP2
B
C
REP3
LH
SIDE
REPEATER
RH
SIDE
REPEATER
PD8b3417.frm
Model 387 Schematics (11 of 59) SK30218 A 1 1
SH 5
NOT USED
REVERSE
LAMP
SWITCH
B
239-7T , BLACK
A
A269-1A, PINK/WHITE
ENG16
242-2 , RED
A269-2 , PINK/WHITE
S2
1
3
REVERSE LAMP
4
5
2
269-1 , PINK/WHITE
E
T
I
H
W
/
K
N
I
P
,
1
9
6
2
A
242-1 , RED
CLC3
3
3
269-1A , PINK/WHITE
CHASS1
S5
269-2 , PINK/WHITE
A
CHASS8
SPARE
BACKUP
, PINK/WHITE
269-3
REVERSE LAMPS
269, BLACK
A
TLJ1-A
A
TLJ2-A
LH RH
REVERSE LAMPS
PD8b3417.frm
Model 387 Schematics (12 of 59) SK30218 A 1 2
SH 53
ICC
LAMPS
HDR2
2
5-1A , ORANGE/BLACK
1
239-1C, BLACK
HDR3
2
5-2 , ORANGE/BLACK
1
239-2A, BLACK
HDR4
2
5-3 , ORANGE/BLACK
1
239-3B, BLACK
HDR5
2
5-4 , ORANGE/BLACK
1
239-4B, BLACK
HDR6
2
5-5 , ORANGE/BLACK
1
239-5B, BLACK
CAB
PANEL
HEADER
CAB LOAD CENTER
CAB
FIREWALL
239-15 , BLACK
239-13 , BLACK
239-12A, BLACK
SH 53
A5-1 , ORANGE/BLACK
A8-1B, BROWN
A5-2 , ORANGE/BLACK
239-14 , BLACK
5-1 , ORANGE/BLACK
25-2, ORANGE/BLACK
NOT USED
A8-1 , BROWN
8-4 , BROWN
789
3
2B
1
6
5B
4
10
CLEARANCE
LAMP
SWITCH
25-1, ORANGE/BLACK
86
30
87A
87
85
S3
8-1 , BROWN 8-5 , BROWN
MARKER
LAMP
8-3 , BROWN
8-2 , BROWN
8
8
CLC3
CHASS1
SH 5
8-1A , BROWN
SH 5
TRAILER LOAD CE NTER
SH 9
WHITE
239-7 ,
, ORN/BLACK
20-1
86
30
MARKER
LAMP
87A
87
85
A5-1A, BLACK
ORANGE/BLACK
5-1B ,
SH 5
MARKER LAMPS
S2S3
8-4B,BROWN
BROWN
,
, BLACK
BROWN
8-6
239-9M
1 HOOD7 8
8-5B,
6
HOOD3
6
8 6
HOOD3-A7
BROWN
BLACK
HOOD3-A6
12
RH
MARKER
LAMP
68
MARKER
LAMP
8-1B, BROWN
BROWN
8-1C ,
S4S5
BROWN
,
8-3B, BROWN
8
BROWN
12
HOOD2
HOOD2-A7
HOOD2-A6
8-2B
1
239-7U, BLACK
BLACK
LH
S6 S7
8-2A, BROWN
CHASS2
C
C
HOOD4
, BROWN
8-1H
S1
8-2G, BROWN
A REP2
8-3A, BROWN
REP1
SPARE
MARKER
8-3H, BROWN
REP3
A
B
RH
TAIL
LAMP
SPARE
MARKER
TLJ1
BROWN
8-4A,
A CHASS9
8-5A, BROWN
8, BLACK
B
TLJ2
LH
TAIL
LAMP
ORANGE
ORANGE 5-2A,
,
5-2AB
LH REPEATERRH REPEATER
PD8b3417.frm
Model 387 Schematics (13 of 59) SK30218 A 1 3
HI BEAM W/LAMP
WARNING
LIGHT
6
BAR
2
5
H
S
E
U
L
B
t
L
,
2
3
5
2
CAB LOAD CENTER
6
LIGHT BAR
, LtBLUE
253-1
BLACK
239-9A ,
HEAD LAMP
SWITCH
789
3
2B
1
6
5B
4
10
HEADLA M P /DRL
DM4-3, LtBLUE
CAB
FIREWALL
CAB PANEL
SH 53
BLACK
LTBLUE
, BLACK
,
,
239-8A
B4-2B
239-12B
BLACK
239-10 ,
TURN
SIGNAL SWITCH
DCAB7 CBA
PARK BRAKE
SWITCH
B5-1, ORANGE/BLACK
B4-3 , LtBLUE
SH 53
SH 52
SH 52
BLACK
BLACK
, LtBLUE
239-15E ,
253-
253-3K , LtBLUE
239-16C,
PASS SIGNAL
SWITCH
789
2B
3
1
5B
6
4
10
B4-1A , LtBLUE
DRLDIS-2A, WHITE/BLACK
DRLDIS-1A, WHITE
42-LH-3 , BLUE/WHITE
E4-1A, LtBLUE/BLACK
A328-1A, LtGREEN
239-38 , BLACK
239-19A , BLACK SH 53
, BLACK
, BLACK
239-17B
239-18B
1
2345678910 CAB13
298-5 , ORANGE
86 30
858787A
B4-1 , LtBLUE B4-2, LtBLUE
DM4-2, LtBLUE
DRLDIS-2, WHITE/BLACK
DRLDIS-1, WHITE/BLACK
43-LH-2 , BLUE/WHITE
E4-1 , LtBLUE/BLACK
A328-1 , LtGREEN
S5
S2
239-14A , BLACK 239-13A , BLACK
S5
228-5 , YELLOW/BLACK
S6
227-5 , GREEN/BLACK
1
5
2
1
5
2
S2
, BLUE/WHITE
239-2RH
239-2LH
A42-LH
S3
HEADLAMP
A4L-1 , LtBLUE
3
DRL LH
4
E4-2 , LtBLUE/BLACK
3
HI BEAM L H
4
239-7B , BLACK
K
E
C
T
I
A
H
L
B
W
/
/
D
E
E
U
R
L
BLUE/ WHITE
B
,
RED/BLACK
,
,
1
-
1
H
L
H
-
L
1
-
4
2
42-RH-1
4
41-RH-1 ,
A4R-1, LtBLUE
20A
1
3
DRL RH
4
5
2
4L-1 , LtBLUE
1
3
HI BEAM RH
4
5
2
8-5G, BROWN
239-1RH
S2
239C, BLACK
A42-RHA, BLUE/WHITE
41-RH, RED/BLACK
42-RH, BLUE/WHITE
41-LH, RED/BLACK
42-LH, BLUE/WHITE
A42-LHA, BLUE/WHITE
239D, BLACK
239-1LH
S4
8-3J , BROWN
20A
DM4-1A, LtBLUE
DM4-2, LtBLUEDM4-2A, LtBLUE
LtBLUE
SH 14
4R-1,
BLACK
239-8 ,
242-6 , RED
242-5 , RED
42-RH-2 , BLUE/WHITE
239-9 , BLACK
BROWN
BLACK
BLACK
BLUE/WHITE
RED
BLUE/WHITE
RED
BLUE/WHITE
BLUE/WHITE
BLACK
BLACK
BROWN
BROWN
S1S5
S1
5A
A42-RH, BLUE/WHITE
SH 14
BROWN
HOOD3-2
2
1
DRL
3
B
RH
A
HEAD LAMP
C
HOOD3-A3
HOOD2-A3
A
LH
C
HEAD LAMP
B
3
1
DRL
2
HOOD2-4
242-7 , RED
1
3
5
2
N
E
E
R
G
t
L
,
2
8
2
3
B
C1 C2 D1 D2B1 B2
A42, BLUE/WHITE
SH 5
D
E
R
,
4
2
4
2
DRL
4
DISABLE
A328-1 , LtGREEN
B328-1 , LtGREEN
SH 14
LtBLUE
,
B4-2
PD8b3417.frm
Model 387 Schematics (14 of 59) SK30218 A 1 4
CAB
LOAD
CENTER
CAB
FIREWALL
A7-2 , PURPLE
298-2AB, ORANGE
27-1 , PURPLE
1
3
FOG LAMP
4
5
2
DISABLE
SH 5
SH 5
SH 52
LtBLUE
,
253-5C
7-3B, PURPLE
FOG LAMP
SWITCH
SH 52
, LtBLUE
253-4E
7
2B
5B
CAB PANEL
SH 53
, BLACK
, BLACK
239-20A
239-22A
9
3
1
6
4
SH 53
BLACK
239-22B ,
A7-1, PURPLE
A7-2, PURPLE
7-3B, PURPLE
PURPLE
,
7-1
1
3
5
2
239-8 , BLACK
239-9 , BLACK
4
FOG LAMP
SH 13
SH 13
7-3 , PURPLE
HOOD5
7-2B, PURPLE
S2
239-12 , BLACK
7-2A, PURPLE
A42, BLUE/WHITE
, PURPLE
SH 13
7-1A, PURPLE
A7-1A
S6
7-3A, PURPLE
239-13H, BLACK
A
B
HOOD6
A
B
LH FOG LAMP
RH FOG LAMP
S3
8
10
FOG LAMPS
PD8b3417.frm
Model 387 Schematics (15 of 59) SK30218 A 1 5
1
382-1A, LtGREEN/REDSH 5
FUEL HEATER
382-1 , LtGREEN/RED
1
HOOD10
FUEL HEATER
2
PD8b3417.frm
Model 387 Schematics (16 of 59) SK30218 A 1 6
HOOD12
AIR DRYER
384-1A , BLUESH 5
384-1 , BLUE
239-4C , BLACK
A
B
S1
AIR
DRYER
PD8b3417.frm
Model 387 Schematics (17 of 59) SK30218 A 1 7
CAB
LOAD
CENTER
CAB
FIREWALL
90-1B , YELLOW/BLUE
637-1B , LtGREEN
636-1B , PURPLE/BLACK
NOT USED
90-1A , YELLOW/BLUE
637-1A , LtGREEN
636-1A , PURPLE/BLACK
542-1A , LtGREEN
LtGREEN
,
542-1
S2
SH 5
CLC3
CHASS1
6
36-1A , GRAY/BLACK
, RED
673-1A
35-1A , GRAY/BLACK
59-1A , VIOLET
239-11B , BLACK
2-1A , TAN/BLACK
6
36-1B , GRAY/BLACK
5
5
35-1B , GRAY/BLACK
7
7
241-1 , GRAY/BLACK
11
11
239-12D , BLACK
12
12
2-1B , TAN/BLACK
326-1A , GREEN
S1 S3
239-6A , BLACK
239-4D , BLACK
239-8B , BLACK
CHASS6
B
A
CHASS4
B
A
CHASS3
A
B
AXLE TEMP
REAR
AXLE TEMP
FORWARD
AUX XMSN
TEMP
327-1A , BLACK
A
CHASS14
F
B
A
AMMETER
NOT AVAILABLE
FUEL TANK
SENDER RH
S2
NOT USED
BLACK
,
326-1B , GREEN
, RED
VIOLET
, GREEN
,
, LtGREEN
673-1
637-1
, PURPLE/BLACK
90-1 , YELLOW/BLUE
636-1
TAN/BLACK
GRAY/BLACK
GRAY/BLACK
59-1
,
35-1 ,
36-1
GRAY/BLACK
GRAY/BLACK
326-1
,
2-1 ,
60-1 ,
327-1
S1
ENG4-B
327-1B
B
A
PYRO
337-1 , BROWN
338-1 , BROWN/BLACK
HOOD14-A
B
A
INTERFACE MODULE
INTERFACE MODULE
KJFBHCAEDG
BLACK
,
239-2D
HOOD9A
BROWN/BLACK
, BROWN
TAN/RED
337-1
338-1 ,
1-1 ,
ACDEFBHOOD10A
239-3C , BLACK
1-1 , TAN/RED
HOOD12-A
B
A
F
LH FUEL TANK
PD8b3417.frm
Model 387 Schematics (18 of 59) SK30218 A 1 8
3
H
5
S
SH 52
LtBLUE
253-8B ,
LtBLUE
,
253-7C
SH 53SH 52
CAB
LOAD
CENTER
239-27C , BLACK
132-1 , RED/TAN
CAB
PANEL
HEADER
239-11C , BLACK
132-1A , RED/TAN
RED/TAN
132-2 , RED/TAN
239-26D , BLACK
A132-1 ,
239-12E , BLACK
789
2B
3
1
6
4
5B
10
SPOT LAMP
SWITCH
SPOT LAMPS
HDR13
21
HDR12
21
PD8b3417.frm
Model 387 Schematics (19 of 59) SK30218 A 1 9
J2
SLEEPER
LOAD
CENTER
SLEEPER 1
CAB
LOAD
CENTER
CAB
FIREWALL
CAB14-SC2
CAB45-SC21032789
A
B
J3
A
B
HEADER
22
249-1F , RED/TAN
LOAD
LAMPS
FLUSH MOUNTED
249-1B , RED/TAN
239-6B , BLACK
249-2A , RED/TAN
239-7C, BLACK
HDR-1
22
249-1G , RED/TAN
6
249-2G, RED/TAN
SINGLE LOAD LAMP OPTION
SLPR8
J1-SC1
1
1
249-1D, RED/TAN
2
2
239-1EE, BLACK
3
3
249-1EE, RED/TAN
4
4
239-1G, BLACK
HDR11_SC2
1
3
ADDITIONAL 10’
J1_SC2
1
3
MUTIPLE FLUSH LOAD LAMP OPTIONS
J2-SC1
A
A
B
B
J1-SC3
J3-SC1
A
A
B
B
J1-SC4
249-1H, RED/TAN
249-2H, RED/TAN
CABLE COILED ( CONNECTION FBO)
5 AMPS MAX PER CIRCUIT
249-2J , RED/TAN
249-1K , RED/TAN
239-1KA, BLACK
239-2M, BLACK
249-2JA , RED/TAN
249-1KA, RED/TAN
239-1KB, BLACK
239-2MA, BLACK
A
COILED-1
J2-SC3
A
B
J2-SC4
A
B
A
COILED
J3-SC3
A
B
J3-SC4
A
B
LOAD
LAMPS
SH 53
SH 52
239-54 , BLACK
253-23A , LtBLUE
789
3
2B
1
6
5B
4
10
SH 53
SH 52
LOAD LAMPS
CAB
PANEL
, RED/TAN
A249-1
BLACK
BLACK
,
239-55 ,
239-56
LOAD LAMP SWITCH
239-54A , BLACK
253-23B , LtBLUE
CAB
LOAD
CENTER
CAB
FIREWALL
9
7
3
2B
1
6
5B
4
8
10
249-1 , RED/TAN
HEADER
CAB
PANEL
, BLACK
239-55A , BLACK
239-56A
239-56B , RED/TAN
LOAD LAMP SWITCH
SH 53
SH 52
249-1A , RED/TAN
239-9B , BLACK
249-2 , RED/TAN
239-10A , BLACK
BRACKET MOUN TED
CAB
LOAD
CENTER
CAB
FIREWALL
RED/TAN
249-1E ,
SLEEPER
254-54D , LtBLUE
239-23D , BLACK
7
2B
5B
8
HDR11
C6-SC1
7
9
3
1
6
4
10
J1
1
1
249-1C, RED/TAN
2
2
239-1D, BLACK
3
3
249-2B , RED/TAN
4
4
239-2B , BLACK
C5-SC1
CAB55-SC2
239-55E , BLACK
LOAD LAMP SWITCH
LOAD LAMP SWITCH
BLACK
239-56E ,
CAB
7
CAB
PANEL
1
239-56F , BLACK
BRACKET MOUNTED/FLUSH MOUNTED AND MULTIPLE/C OILED 10’
PD8b3417.frm
Model 387 Schematics (20 of 59) SK30218 A 2 0
SH 53
SH 52
CAB
LOAD
CENTER
CAB
PANEL
FL OUR L A MP SWITC H
SLEEPER
CAB
FIREWALL
253-9 , LtBLUE
239-24B, BLACK
789
C6
1
2
3
C5
1
2
CAB
3
SLEEPER
LOA D
CENTER
SLEEPER 2
253-1A, LtBLUE
239-24 , BLACK
B19-1, VIOLET/WHITE
A19-1, VIOLET/WHITE
B19-2, VIOLET/WHITE
D19-1 , VIOLET/WHITE
239-23 , BLACK
SPARE-2B, WHITE
SLEEPER 1
239-30 , BLACK
S5
SPARE-1B, WHITE
B19-2A, VIOLET/WHITE
B19-1A, VIOLET/WHITE
280-4 , ORANGE
SLPR17
9
7
1
2
5
3
4
6
8
10
SLPR18
1
2
4
3
789
2B
5B
3
1
6
4
10
FLUOR LAMP
FLUOR LAMP SWITCH
3
2B
1
6
4
5B
10
FLUO RESCENT LAMP SLEEPER
PD8b3417.frm
Model 387 Schematics (21 of 59) SK30218 A 2 1
SH 52
CAB LOAD
CENTER
CAB
PANEL
S9
BLACK
,
FRL-4, RED/BLACK
239-42
CAB31
B
A
FLOOR LAMP
S8
239-41 , BLACK
FRL-1, RED/BLACK
BLACK
, RED/BLACK
239-43 ,
FRL-3
CAB32
B
A
S5
226-15 , RED
239-39 , BLACK
253-17 , LtBLUE
239-40 , BLACK
FRL-2, RED/BLACK
FLOOR LAMP SWITCHLH LAMPRH LAMP
9
7
3
2B
1
6
4
5B
8
10
PD8b3417.frm
Model 387 Schematics (22 of 59) SK30218 A 2 2
SH 5
230-1 , ORANGE
A83-1A , ORANGE/WHITE
1
3
ETHER
4
5
SH 5
2
SH 52
SH 53
253-9A, LtBLUE
239-29A , BLACK
SH 52
SH 53
, ORANGE/WHITE
83-1
, LtBLUE
BLACK
253-8
, PURPLE
239-28 ,
A83-1 , ORANGE/WHITE
A29-2
9
7
3
2B
1
ETHER
SWITCH
6
5B
4
10
8
ETHER START CATERPILLAR
239-3D, BLACK
SH 52
83-1A , ORANGE/WHITE
ENG12
1
ETHER
SOLENOID
PD8b3417.frm
Model 387 Schematics (23 of 59) SK30218 A 2 3
CAB LOAD CENTER
DOOR
POSITION 1 POSI T ION 0 POSITION 2
132465132465132465
PASSENGER WINDOW LIFT
POSITION 1 POSITION 0 POSITION 2
213542135421354
DRIVER WINDOW LIFT
253-2A, LtBLUE
239-4E, BLACK
226-4 , RED
226-3 , RED
POSITION 1 POSITION 0 POSITION 2
132465132465132465
PASSENGER WINDOW LIFT
253-2B , LtBLUE
239-4G , BLACK
226-4A , RED
226-3B , RED
74-1B , TAN/WHITE
73-1B, GRAY/LtBLUE
DOOR5-L
4
253-3A , LtBLUE
3
226-5 , RED
2
239-5C , BLACK
5
73-2 , LtBLUE/TAN
1
74-2, TAN/LtBLUE
S1
SH 24
74-1 , TAN/WHITE
73-1 , GRAY/LtBLUE
S4
226-1A , RED
253-1B , LtBLUE
S1
SH 24
SH 24
S4
226-1C , RED
253-1D, LtBLUE
AB DOOR7 -L
M
DRIVER
WINDOW
LIFT
253-2M , LtBLUE
226-3G , RED
226-3A, RED
253-2L , LtBLUE
CAB LOAD CENTER
DOOR
226-1D, RED
226-2, RED
226-3, RED
S8
SH 52
226-1B, RE D
226-2, RED
226-3, RED
253-1C , LtBLUE
74-1A, TAN/LtBLUE
73-1A, LtBLUE/TAN
S8
SH 52
253-1S, LtBLUE
74-1E , TAN/LtBLUE
73-1E , LtBLUE/TAN
226-2H , RED NOT USED
S3
226-2G, RED NOT USED
S3
253-3 , LtBLUE
253-3L , RED
74-1C , TAN/WHITE
73-1C, GRAY/LtBLUE
253-1E , LtBLUE
74-1D, TAN/WHITE
73-1D , GRAY/LtBLUE
253-1F , LtBLUE
SH 24
S1
73-2B, GRAY/LtBLUE
POSITION 1 POSITION 0 POSITION 2
132465132465132465
PASSENGER WINDO W LI FT
239-3F, BLACK
S1
253-2C , LtBLUE
73-2A , GRAY/LtBLUE
74-2A , TAN/WHITE
DOOR7-R
AB
PASSENGER
WINDOW LIFT
M
132465132465132465
SH 24
239-3F , BLACK
253-2D , LtBLUE
74-2B, TAN/WHITE
MOTOR
POSITION 1 POSI T ION 0 POSITION 2
PASSENGER WINDOW LIFT
WINDOW LIFT
PASSENGER
WINDOW
LIFT
ABDOOR7-RA
M
PD8b3417.frm
Model 387 Schematics (24 of 59) SK30218 A 2 4
CAB LOAD
CENTER
DOOR
SH 4
BLACK
, ORANGE
,
SH 23
SH 23
239-5C , BLACK
239-4G , BLACK
S5
239-1J , BLACK
230-1A , ORANGE
239-3M, BLACK 239-4V , BLACK
S1
230-3A , ORANGE
230-1B
239-1P
S2
230-4 , ORANGE
REF_DES7
B
A
NOT USED
239-5H , BLACK
S2
239-3F , BLACK
SH 23
253-4 , LtBLUE
DOOR
LOCK
SWITCH
POSITION 1 POSITION 0 POSITION 2
132465132465132465
230-2 , ORANGE
230-3 , ORANGE
LOCK2-1, BLACK/GRAY
LOCK1-1, GRAY/BLACK LOCK2A-3, BLACK/GRAY
239-6C , BLACK
S4
S3
LOCK2-1, BLACK/GRAY
LOCK1-1, GRAY/BLACK
LOCK1A-1, GRAY/BLACK
LOCK2A-1, BALCK/GRAY
AB D OOR9
M M
LOCK-2, BLACK/GRAY
LOCK-1, GRAY/BLACK
LOCK-1A, GRAY/BLACK
LOCK-2A, BLACK/GRAY
LOCK2-1A, BLACK/GRAY
LOCK1-1A, GRAY/BLACK
LOCK1A-3, GRAY/BLACK LOCK1A-1B, GRAY/BLACK
S1
S4
S3
LOCK1A-2, GRAY/BLACK
LOCK2A-2, BLACK/GRAY
BA
DOOR9_C0
239-4W, BLACK
253-3J , LtBLUE
LOCK2A-1A, BLACK/GRAY
POSITION 1 POSITION 0 POSITION 2
132465132465132465
DOOR
LOCK
SWITCH
CENTRAL DOOR LOCKS
PD8b3417.frm
Model 387 Schematics (25 of 59) SK30218 A 2 5
2
1
CAB
LOAD
CENTER
HEADER
19-1C, VIOLET/WHITE
239-6D, BLACK
329-1 , PINK/GREEN
19-2A , VIOLET/WHITE
239-7D, BLACK
329-2 , PINK/GREEN
19-3A , VIOLET/WHITE
239-8C, BLACK
329-3 , PINK/GREEN
HDR7
1
2
3
HDR8
1
2
3
HDR9
1
2
3
DRIVER
DOME
LAMP
CENTER
DOME
LAMP
PASSANGER
DOME
LAMP
3
2
1
3
2
1
3
CAB
PANEL
S11
S5
329-2A , PINK/GREEN329-1A , PINK/GREEN
239-49 , BLACK
CAB42-B
B
A
DOOR
SWITCH
LH
DOOR
CAB41
DOOR
S2
WHITE
A
B
SWITCH
RH
239-50 , BLACK
329-3A , PINK/GREEN
S5
, VIOLET/WHITE
19-1
239-3J , WHITE
21
DOOR8_C2
R
O
O
D
A
M
P
L
H
L
DOOR LAMPS/DOME LAMPS
S5
19-3 , VIOLET/WHITE19-2 , VIOLET/WHITE19-1A , VIOLET/WHITE
19-1B , VIOLET/WHITE
239-1K ,
12
DOOR8_C3
R
O
O
D
P
A
M
L
H
R
PD8b3417.frm
Model 387 Schematics (26 of 59) SK30218 A 26
A
A
D2
D1
DRAIN-29
REF DES
DRAIN-28
DRAIN-25
436-2 , WHITE
436-2 , BLACK
DRAIN-22
A
A
B
PS10R
B
C
C
PS9R
432-3 , BLACK
436-3 , WHITE
DRAIN-24
PS12FEDCBA
PS11A BCDEF
PSR-1
A
TWEETER
B
DRAIN
PS3R
B
SPEAKER FRONT
A
DRAIN
239-1 , BLACK
19-1 , VIOLET/WHITE
A252-1 , RED
CAB
LOAD
CENTER
RADIO/
CB
DRAIN-1
TWEETER
SPEAKER FRONT
B
A
PS2L-1
PS3L
A
B
DRAIN
DRAIN
430-2 , BLACK
434-2 , WHITE
434-3 , WHITE
430-3 , BLACK
433-1 , VIOLET
437-1 , VIOLET/BLACK
431-1 , GREEN
435-1 , GREEN/BLACK
432-1 , GRAY
436-1 , GRAY/BLACK
430-1 , WHITE
434-1, WHITE/BLACK
DASH CONNEC TION
DRAIN-17
DRAIN-18
PS7L
BLACK
432-1 ,
HGFEDCBA
DRAIN-26
DRAIN-27
BLACK
, WHITE
,
, WHITE
435-1
431-1
433-1 , BLACK
437-1
RAD2
ABCDEFGHPS1
WHITE
BLACK
WHITE
,
430-1
434-1 ,
436-1 ,
A
A
B
B
C
C
PS8L
RADIO
PREMIUM SOUND
B-PILLAR
FLOOR
GROUND
ANTENNA
SPEAKER REAR
SLEEPER SPARE POWER
PS4L
A
B
SH 46
21PS5
435-2 , WHITE
431-22 , BLACK
PWR_NEG, BLACK
PWR_POS, RED
DRAIN-20DRAIN-19
433-2 , BLACK
437-2 , WHITE
WHITE
BLACK
BLACK
DRAIN-21
DRAIN-23
, WHITE
,
437-3 ,
435-3
431-3
PS6
SUB WOOFER
DRAIN
4353-3 ,
DRAIN
HGDCABFE
DRAINDRAIN
PS4R
B
SPEAKER REAR
A
PD8C3417.FRM
Model 387 Schematics (27 of 59) SK30218 A 27
SH 33
329-4, PINK/ GRE EN
SLPR9
SLEEPER
LOAD
CENTER
SLEEPER 1
329-1B , PINK/GREEN
239-8D, BLACK
389-1 , GRAY
239-9C, BLACK
329-2B , PINK/GREEN
239-10B , BLACK
389-2 , GRAY
239-11D, BLACK
1
2
SLPR11
1
2
LH TOOL BOX LAMP
LH DOOR SWITCH
RH TOOL BOX LAMP
SLEEPER TOOL BOX LAMPS
RH DOOR SWITCH
PD8C3417.FRM
Model 387 Schematics (28 of 59) SK30218 A 28
SLEEPER
LOAD
CENTER
226-1E , RED
SLEEPER 1 12:00
280-2 , ORANGE
239-5F , BLACK
SLEEPER CLOCK
PD8C3417.FRM
CLOCK
Model 387 Schematics (29 of 59) SK30218 A 29
CAB
LOAD
CENTER
HDR14
HEADER
229-1 , VIOLET/WHITE
239-13B , BLACK
AUX FAN
1
2
M
AUX
FAN
PD8C3417.FRM
Model 387 Schematics (30 of 59) SK30218 A 30
SLEEPER
LOAD
CENTER
SLEEPER 1
19-1D, VIOLET/WHITE
239-1L , BLACK
19-2B , VIOLET/WHITE
239-2G, BLACK
W/LOW ER BUNK
SLPR3
1
2
SLPR4
1
2
SLEEPER READING LAMPS
RH READING
LAMP
LH READING
LAMP
SLEEPER
LOAD
CENTER
SLEEPER 1
SLPR1-SC1
19-1DA, VIOLET/WHITE
13
239-1LA , BLACK
1
14
19-2BA, VIOLET/WHITE
2
239-2GA, BLACK
SLPR3-SC1
1
1
19-1G, VIOLET/WHITE
2
2
239-1AH, BLACK
J1-SC2
W/UPPER BUNK
SLPR4_SC1
1
2
1
2
J1-SC5
19-1H, VIOLET/WHITE
239-1AJ , BLACK
19-2G, VIOLET/WHITE
RH READING
LAMP
J2-SC2
1
2
239-2AH, BLACK
19-2H, VIOLET/WHITE
LH READING
LAMP
J2-SC5
1
2
239-2AJ , BLACK
J3-SC2
1
2
J3-SC5
1
2
HI/RH READING
LAMP
HI/LH READING
LAMP
PD8C3417.FRM
Model 387 Schematics (31 of 59) SK30218 A 31
SH 52
253-2R, LtBLUE
239-20 , BLACK
SLPR30
2
REFER
REF1-1, RED
1
239-22 , BLACK
SLEEPER
LOAD
CENTER
SLEEPER 2
AREF-1, YELLOW/BLACK
REFRIGERATOR UNIT/REFR
SLPR16
253-1H, LtBLUE
239-15A , BLACK
REFRIGERATOR ON/OFF
SWITCH
BREF-1, BLACK/YELLOW
239-37, BLACK
COOLING FAN
RED
FAN2
FAN3
FAN4
B
B
A
A
FAN
B
B
A
A
12
REFRIGERATOR
1
2
FAN1
B
B
A
A
BLACK
BLACK
RED
,
PD8C3417.FRM
Model 387 Schematics (32 of 59) SK30218 A 32
SLEEPER
LOAD
CENTER
SLPR21-A
SLEEPER 2
280-1 , YELLOW
1
239-27A , BLACK POWER
242-1A , RED
139-13A , BLACK
SLPR22-A
1
ACCESS
242-2A , RED
239-14B , BLACK
SLPR19-A
1
2
SLPR20-A
1
2
POWER OUTLET
POWER OUTLET
SLEEPER POWER ACCESS OUTLETS
PD8C3417.FRM
Model 387 Schematics (33 of 59) SK30218 A 33
SLPR13-A
1
SLEEPER
LOAD
A329-12, RED
2
FLOOR LAMP
CENTER
SLEEPER 1
SLEEPER FLOOR LAMP
239-12, BLACK
329-6, RED
SH 27
FLOOR
LAMP
SWITCH
329-4, PINK/GREEN
PD8C3417.FRM
Model 387 Schematics (34 of 59) SK30218 A 34
SLEEPER
SH 9
LOAD
CENTER
152-1A , RED/YELLOW
253-10A , LtBLUE
SLEEPER 2
CAB
570-1 , YELLOW/WHITE
226-5A , RED
SH 5
153-1A , RED/BLUE
240-1A , LtGREEN/WHITE
153-2 , RED/BLUE
30
86
SLEEPER
239-18 , BLACK
S2
HVAC
85
87A
A248-1A, RED/BLACK
87
248-1 , RED
SLPR23-A
1
2
3
SPR25-A
A
BLOWER MOTOR
B
BLOWER MOTOR
RESISTORS
SLEEPER HVAC
239-35, BLACK
S5
239-26A , BLACK
HVAC CONTROL
HEAD
239-25A , BLACK
629-1A , BLUE
630-1 , RED/BLUE
BUNK TEMP
ACTUATOR
PD8C3417.FRM
Model 387 Schematics (35 of 59) SK30218 A 35
DIGITAL
MESSAGE
CENTER
226-1F , RED
230-1C, ORANGE
239-1M, BLACK
417-1C, PURPLE
418-1C, WHITE
253-1J , LtBLUE
SH 49
SH 49
SH 52
DMC3
1
2
SPARE IGN
POWER
SPARE BAT
POWER
SH 50
TO OPTIONAL SPARE/
POWER EXPANSION
SH 50
DIGITAL MESSAGE CENTER
PD8C3417.FRM
Model 387 Schematics (36 of 59) SK30218 A 36
ABS1
1
CAB
LOAD
10
CENTER
8
5
2
7
ABS
6
12
4
9
11
3
GND-A, GREEN/YELLOW
GND-B, GREEN/YELLOW
LIGHT
BAR
18
19
20
21
ABS2
X2-1, BLUE
X3-7, BLUE
X4-1, BLUE
X4-10, BLUE
X2-2 , BROWN
X3-8, BROWN
X4-2 , B ROWN
X4-11 , BR OWN
X2-4 , BROWN
X2-5 , BLACK
X3-4 , BR OWN
X3-5, BLACK
X4-5 , BROWN
X4-6, BLACK
X4-8 , BROWN
X4-9, BLACK
A
B
C
D
E
F
G
H
J
K
L
M
N
P
Q
R
S
T
U
V
W
X
Y
Z
A1
B1
C1
D1
E1
F1
G1
ABS1-B1
A
B
C
D
E
F
G
H
J
K
L
M
N
X2-4B
P
X2-5B
Q
R
S
T
U
V
W
X
Y
Z
A1
B1
C1
D1
E1
F1
G1
X
1
X
X
1
X2-1B
X3-7B
X4-1B
X4-10B
X2-2B
X3-8B
X4-2B
X4-11B
X4-4B
X4-7B
X3-4B
X3-5B
X4-5B
X4-6B
X4-8B
X4-9B
X5-1B
X5-10B
X5-2B
X5-11B
X5-5B
X5-6B
X5-8B
X5-9B
X4-14B
X4-15B
WARNING
LAMP
18
BAR
19
20
21
1
-
1
2
-
1
X1-12-6
2
-
1
2
-
X1-12-3
2
-
4
1
-
X1-12-5
X2-5B
X2-4B
RF SENSOR AND PMV CO NNECTORS RR SENSOR AND PMV CONNECTORS
ABS2-B1
1
X1-12-1
23
X3-7B
ABS3-B1
X3-8B
1
2
X3-5B
X3-4B
1 2
ABS6-B1
X4-9B
X4-8B
1
X1-12-3
23
X4-10B
ABS7-B1
X4-11B
ABS10-B1
X4-4B
X4-7B
ABS11-B1
X1-12-5
X5-1B
X5-10B
X5-2B
X5-11B
X5-5B
X5-6B
X5-8B
X5-9B
X4-14B
X4-15B
X1-12-6
X2-2B
X2-1B
X1-12-4
X4-6B
X4-5B
X4-1B
X1-12-2
X4-2B
1
ATC CONNECTOR
(OPTION)
2
1
2
3
4
5
6
A
6
-
C
H
7
8
9
10
11
12
(
C
T
O
R
N
N
E
E
L
C
O
N
N
)
N
A
L
O
P
T
O
I
ABS
ECU
X1-11 , BLACK
X1-12 , BLACK
SH 4
SH 4
X1-6-1 , ORANGE/PURPLE X1-6-1 , ORANGE/PURPLE
X1-7, RED
X1-8, ORANGE
X1-9 , ORANGE
X1-10 , BLACK
X1-16-1 , ORANGE/PURPLE
X1-17, BLACK/LtGREEN
X1-18, VIOLET/BROWN
X2-3, GREEN/YELLOW
X1-16-1 , ORANGE/PURPLE
X1-17 , BLACK/LtGREEN
S2
X1-7, RED
X1-8 , ORANGE
X1-9 , ORANGE
X1-10 , BLACK
X1-18 , VIOLET/BROWN
X2-1 , BLUE
X2-2 , BROWN
X2-4 , BROWN
X2-5 , BLACK
X3-7 , BLUE
X3-8 , BROWN
X3-9, GREEN/YELLOW
X3-4 , BROWN
X3-5 , BLACK
X4-3 , GREEN/YELLOW
X4-12, GREEN/YELLOW
S1
X4-1 , BLUE
X4-10 , BLUE
X4-2 , BROWN
X4-11 , BROWN
X4-5 , BROWN
X4-6 , BLACK
X4-8 , BROWN
X4-9 , BLACK
ABS LOW
12
ABS4-B1
23
1
ABS5-B1
12
ABS8-B1
ABS9-B1
1
23
LR SENSOR AND PMV CONNECTORSLF SENSOR AND PMV CONNECTORS
PD8C3417.FRM
Model 387 Schematics (37 of 59) SK30218 A 37
789
2B
3
1
6
4
5B
SH 4
SH 4
10
X1-6-1A , ORANGE/PURPLE
X1-8A, ORANGE
X1-9A, ORANGE
X1-10A, BLACK
X1-11A , BLACK
X1-12A, BLACK
X1-16-1A , ORANGE/PURPLE
X1-17A , BLACK/LtGREEN
X1-18A, VIOLET/BROWN
X1-13A, WHITE
X1-14A , PURPLE
X2-3A, GREEN/YELLOW GND-BB, GREEN/YELLOW
X2-1A, BLUE
X2-2A, BROWN
X2-4A, BROWN
X2-5A , BLACK
X3-7A, BLUE
X3-8A, BROWN
X3-9A, GREEN/YELLOW
ABS
X3-4A , BROWN
ECU
X3-5A , BLACK
X4-3A , GREEN/YELLOW
X4-12A , GREEN/YELLOW
X4-1A , BLUE
X4-10A , BLUE
X4-2A, BROWN
X4-11A , BROWN
X4-4A , BROWN
X4-7A , BLUE
X4-5A , BROWN
X4-6A , BLACK
X4-8A, BROWN
X4-9A , BLACK
X5-3A, GREEN/YELLOW
X5-12A, GREEN/YELLOW
X5-1A, BLUE
X5-10A , BLUE
X5-2A , BROWN
X5-11A , BROWN
X5-5A , BROWN
X5-6A , BLACK
X5-8A, BROWN
X5-9A, BLACK
S1
S2
X1-6-2, ORANGE/PURPLE
ABS
SWITCH
, BLACK
239-3K
239-2H , BLACK
X1-6-1A , ORANGE/PURPLEX1-7A, RED
X1-16-1A , ORANGE/PURPLE
X1-17A , BLACK/LtGREEN
X1-16-2 , ORANGE/PURPLE
253-1K , LtBLUE
239-1N , BLACK
X1-7A, RED
X1-8A, ORANGE
X1-9A , ORANGE
X1-10A, BLACK
X1-18A , VIOLET/BROWN
GND-AA, GREEN/YELLOW
ABS1-A
8
5
CENTER
10
1
2
7
ABS
6
12
4
9
11
3
ABS10-A
B
A
ABS2-A
X2-1A, BLUE
X3-7A, BLUE
X4-1A, BLUE
X4-10A , BLUE
X2-2A , BROWN
X3-8A , BROWN
X4-2A , BROWN
X4-11A , BROWN
X4-4A , BROWN
X4-7A, BLUE
X2-4A , BROWN
X2-5A , BLACK
X3-4A , BROWN
X3-5A , BLACK
X4-5A , BROWN
X4-6A , BLACK
X4-8A , BROWN
X4-9A , BLACK
X5-1A, BLUE
X5-10A , BLUE
X5-2A , BROWN
X5-11A , BROWN
X5-5A , BROWN
X5-6A , BLACK
X5-8A , BROWN
X5-9A , BLACK
CAB
LOAD
SH 49
J1587
LIGHT
BAR
A
B
C
D
E
F
G
H
J
K
L
M
N
P
Q
R
S
T
U
V
W
X
Y
Z
A1
B1
C1
D1
E1
F1
G1
ABS1-B2
A
B
C
D
E
F
G
H
J
K
L
M
N
P
Q
R
S
T
U
V
W
X
Y
Z
A1
B1
C1
D1
E1
F1
G1
18
19
20
21
X
X
X
X2-1C
X3-7C
X4-1C
X4-10C
X2-2C
X3-8C
X4-2C
X4-11C
X4-4C
X4-7C
X2-4C
X2-5C
X3-4C
X3-5C
X4-5C
X4-6C
X4-8C
X4-9C
X5-1C
X5-10C
X5-2C
X5-11C
X5-5C
X5-6C
X5-8C
X5-9C
X4-14C
X4-15C
18
19
WARNING
LAMP
BAR
20
21
-
A
1
1
-
1
2
X1-12-6A
1
-
A
2
2
1
-
X1-12-3A
-
A
4
1
-
1
2
X1-12-5A
X2-5C
X2-4C
12
RF SENSOR AND PMV CONNECTORS RR SENSOR AND PMV CONNECTORS
ABS6-B2
1 2
X4-8C
X4-1C
X1-12-2A
1
23
ABS9-B2
1
23
X4-9C
X4-10C
X1-12-3A
ABS4-B2
ABS2-B2
1 2
X3-4C
1
23
ABS3-B2
X3-5C
X3-8C
X3-7C
X1-12- 1A
X2-2C
X2-1C
X1-12-4A
X4-6C
X4-5C
X4-2C
1
23
ABS5-B2
12
ABS8-B2
LR SENSOR AND PMV CONNECTORSLF SENSOR AND PM V CONNECTORS
ABS7-B2
X4-11C
X4-4C
X4-7C
X1-12-5A
X5-1C
X5-10C
X5-2C
X5-11C
X5-5C
X5-6C
X5-8C
X5-9C
X4-14C
X4-15C
X1-12-6A
ABS HI
ABS10-B2
1
ATC CONNECTOR
(OPTION)
2
ABS11-B2
1
2
3
4
5
6-CHANNEL CONNECTOR
6
7
8
9
10
11
12
(OPTIONAL)
PD8C3417.FRM
Model 387 Schematics (38 of 59) SK30218 A 38
CAB
LOAD
CENTER
OUTLET
241
CAB54
CAB33 1 CAB35 1
1
1
CAB36
CAB34
ORANGE
,
ORANGE
,
239-45 , BLACK
280-2A
280-1A
CAB CIGAR LIGHTER/POWER CONNECTION
239-44 , BLACK
PD8C3417.FRM
Model 387 Schematics (39 of 59) SK30218 A 39
S7
S6
S5
SPARE
BLACK
LtBLUE
, RED
226-14
239-35 , BLACK
,
239-37
,
253-16
SPARE "A" SPARE "B"
PD8C3417.FRM
Model 387 Schematics (40 of 59) SK30218 A 40
WARNING LAMP BAR
917
917
LIGHT BAR
CAB LOAD CENTER
CLC3
CAB
FIREWALL
, GRAY/BLACK
GRAY/BLACKSPARE-1
SPARE-A ,
1
1CHASS1
, WHITE SPARE-1A
CAB
PANEL
226-10A, RED
S7
S6
S5
RED
BLACK
YELLOW/BLUE
,
,
226-11
239-32 ,
A90-1
TWO SPEED
AXLE
253-11 , LtBLUE
D CAB23CBA
WHITE/RED
226-12 , RED
145-1 ,
INTER
AXLE
LtBLUE
,
253-12
239-33 , BLACK
D
CBA
CAB24
ORANGE/BLACK
, RED
226-13
192-1 ,
FIFTH
WHEEL
LtBLUE
253-13 ,
239-34 , BLACK
D CAB25CBA
SPARE, GRAY/BLACK
DIFF LOCK/
PTO
BLACK
253-15 , LtBLUE
239-36 ,
TWO SPEED AXLE/INTER AXLE/
FIFTH WHEEL/DIFF LOCK/PTO
CHASS13
1
SPARE
PD8C3417.FRM
Model 387 Schematics (41 of 59) SK30218 A 41
CUMMINS
ENGINE
ECU
CAT
ENGINE
ECU
ECU
31
7
6
5
19
ENG2A
2
54
49
18
457-2A , BLACK 457-4A , BLACK
OEM
ENGINE
HARNESS
567-1B , RED/GREEN
568-1B , LtGREEN/BLUE
569-1B , LtGREEN/PINK
S3
517-1 , RED/GREEN
519-1 , LtGREEN/BLUE
520-1 , LtGREEN/PINK
CATERPILLAR
CLC2-B
ENG3-C
B5
B5
567-1C, RED/GREEN
C1
C1
568-1C , LtGREEN/BLUE
C2
C2
569-1C , LtGREEN/PINK
C3
C3
457-5B , BLACK
CUMMINS
567-1A, RED/GREEN
568-1A , LtGREEN/BLUE
569-1A , LtGREEN/PINK
457-5 , BLACK
CLC12-B
FW1-B
10
10
12
12
11
11
9
9
568-1D, LtGREEN/BLUE
569-1D, LtGREEN/PINK
LOW COOLANT
CLC12
10
12
11
9
567-1D, RED/GREEN
457-1C, BLACK
567-1 , RED/GREEN
568-1 , LtGREEN/BLUE
569-1 , LtGREEN/PINK
457-1 , BLACK518-1 , BLACK/PINK
FW7
C
A
D
B
FW7-A
C
A
D
B
C
A
D
B
LOW
COOLANT
PROBE
LOW
COOLANT
PROBE
PD8C3417.FRM
Model 387 Schematics (42 of 59) SK30218 A 42
ENGINE
CUMMINS
ECU
CATERPILLAR
OEM HARNESS
ENGINE
ECU
680-1 , RED
679-1 , YELLOW
239-9H, BLACK
S2
8
9
11
680-1A , RED
679-1A , YELLOW
RTN-1, BLACK/RED
ENG18-B
ENG20
EATON TOP 2 TRANSM ISSION
C
A
B
A
B
C
PD8C3417.FRM
Model 387 Schematics (43 of 59) SK30218 A 43
S5
K
C
A
L
B
,
K
2
-
9
3
2
7
LT GREEN/YELLOW
1
S2
S8
N
A
T
/
N
A
T
, RED
,
2
-
5
6
226-2B
6
BLACK
5674321
DOOR10-L
573-1A , WHITE/ORANGE
574-1A, GRAY/VIOLET
CBA
M M
LH MIRROR
665-3 , WHITE/TAN
DORR3-L
GREEN
LT GREEN/BLACK
GREEN/RED
574-2 , TAN/LtBLUE
573-2 , TAN/LtBLUE
665-1A , BLUE/TAN
, BROWN/YEL
239-7E , BLACK
302-1
DOOR11-L
BA
MIRROR HEAT
4
5
6
574-1 , TAN/LtBLUE
573-1 , LtBLUE/TAN
665-1 , BLUE/TAN
302-2 , BROWN/YELLOW
HEATED MIRROR SWITCH
S4
S1
S2
ORANGE
BROWN/YELLOW
,
230-5B
302-1C ,
239-6T , BLACK
7
2B
5B
8
253-1AZ , LTBLUE
302-3 , BROWN/YELLOW
S3
LtBLUE
302-4 , BROWN/YELLOW
239-5X , BLACK
253-4CC,
9
3
1
6
4
10
574-1B , TAN/LtBLUE
573-1B , TAN/LtBLUE
665-1B , WHITE/TAN
302-1A , BROWN/YELLOW
663-2 , LTBLUE/TAN663-1 , LTBLUE/TAN
239-1AZ , BLACK
226, RED
ABC
M M
RH MIRROR
DOOR3-R
S2
239-2L , BLACK
AB
DOOR5-R
MIRROR HEAT
LT
GREEN2BROWN
3
MT4
1
MIRROR
MIRROR SWITCH
MIRROR CO NT ROL/HEATER/GLARESTOPPE R
253-2AX, LTBLUE
MT6
1
1
BACKLIGHTING
MT5
239-2BZ , BLACK
GLARESTOPPER SWITCH
789
3
2B
1
6
4
5B
10
MT1
12
1
CAB SPARE POWER MIRROR
GLARESTOPPER OPTIONAL
PD8C3417.FRM
MT3
Model 387 Schematics (44 of 59) SK30218 A 44
646-1 , BLACK
CUMMINS
ENGINE
ECU
CAT
ENGINE
ECU
532-1 , PINK/GREEN
530-1 , YELLOW
529-1 , BLUE
647-1 , LtGREEN/YELLOW
647-2 , GREEN/BLACK
646-2 , BLACK
531-1 , PINK
648-1 , LtGREEN/BLACK
534-1 , GREEN
466-1 , WHITE/RED
462-1 , YELLOW
457-1A , BLACK 224-1 , LtGREEN/YELLOW
S4
461-1 , BLUE
457-8 , BLACK
457-7 , BLACK
463-1 , PINK
225-1 , LtGREEN/BLACK
A508-1 , BLUE
465-1 , GREEN
EE28-1 , GREEN
EE01-1, BLACK/WHITE
EE01-4, BLACK/WHITE
EE05-1, LtGREEN/BLACK
EE11-1 , GREEN/WHITE
EE16-1, BLUE
EE07-1 , PINK
EE06-1, YELLOW/BLACK
EE04-1, LtGREEN/YELLOW
EE08-1 , BLUE
EE17-1, YELLOW
EE28-1, GREEN
S1
EE01-3, BLACK/WHITE
EE01-4 , BLACK/WHITE
AEE02-1, BLACK/LtGREEN
EE05-1, LtGREEN/BLACK
EE04-1, LtGREEN/YELLOW
226-2C , RED
B226-1 , RED/BLUE
239-6E , BLACK
239-5G, BLACK
253-4A , LtBLUE
B226-1 , RED/BLUE
239-4J , BLACK
253-3C , LtBLUE
ENG5
1
ENG6
1
789
3
2B
1
6
5B
4
10
9
7
3
2B
1
6
5B
4
10
8
CLUTCH
SWITCH
ENGINE BRAKE
ON/OFF SWITCH
ENGINE BRAKE
SELECTOR SWITCH
A
B
K
C
A
L
B
,
J
3
1
9
3
2
S2
NEUTRAL
SWITCH
ENG17-B
A509-1 , BLUE
NOT USED
SH 52
SH 53
, LtGREEN
239-7N, BLACK
253-5B , LtBLUE
EE15-1
789
2B
3
1
6
4
5B
10
DIAGNOSTIC
SWITCH
SH 53
SH 53
SH 53
SH 53
SH 52
SH 52
, BLACK/WHITE
EE01-7
RED
,
, GREEN/WHITE
226-1H
EE16-1, BLUE
EE11-1
ENG
CAB
LOAD CENTER
239-2GG, BLACK
239-2HH, BLACK
239-1HH, BLACK
253-2P , LtBLUE
253-1U , LtBLUE
, BLACK
, RED/BLUE
239-3FF
A226-1
789
2B
5B
CRUISE
ON/OFF SWITCH
SH 53
S
H
5
BLUE
,
EE08-1
RED
226-2C,
EE01-6 , BLACK/ WHITE
A226-1, RED/BLUE
3
1
6
4
10
2
EE17-1, YELLOW
LtBLUE
, BLACK
253-2Q,
239-4AA, BLACK
EE01-5
9
7
3
2B
1
6
5B
4
10
8
CRUISE
SET/RESUME SWITCH
ENGINE BRAKE/CRUISE CONTROL/DIAGNOSTIC
PINK
,
EE07-1
PD8C3417.FRM
Model 387 Schematics (45 of 59) SK30218 A 45
RAD_3A
FRONT
SPEAKER
B
A
, WHITE
FR_SPKR_POS-A
FR_SPKR_NEG-A, BLACK
REAR
SPEAKER
B
A
BLACK
REAR_SPKR_POS-A, WHITE
REAR_SPKR_NEG-A,
RAD_2A
RAD_1A
RAD_2
D
D
435-1 , GREEN/BLACK
C
C
431-1 , GREEN
B
B
434-1 , WHITE/BLACK
A
A
430-1 , WHITE
REMOTE
CAB
LOAD
CENTER
RADIO/CB
RAD_3B
FRONT
SPEAKER
B
A
REAR
SPEAKER
A
B
RAD_2B
BLACK
, BLACK
A252-1A , RED
239-1B , BLACK
FR_SPKR_POS-B, WHITE
19-1F , VIOLET/WHITE
FR_SPKR_NEG-B,
RAD_1
RAD_1B
A
432-1 , GRAY
436-1 , GRAY/BLACK
433-1 , VIOLET
437-1 , VIOLET/BLACK
VIOLET/WHITE
WHITE/BLACK
WHITE
GRAY/BLACK
GRAY
,
A252-1A , RED
19-1F ,
434-1 ,
430-1 ,
1RMT_1
239-1B , BLACK
436-1 ,
432-1
D CBA
, VIOLET/BLACK
435-1 , GREEN/BLACK
431-1 , GREEN
433-1 , VIOLET
437-1
RAD_4
ABCD
RAD_4A
A
B
B
C
C
D
D
REAR_SPKR_POS-B, WHITE
REAR_SPKR_NET-B
RADIO
B-PILLAR
RED
WHITE
WHITE/BLACK
BLUE
BLACK
GRAY
YELLOW
GRAY/BLACK
GREEN
VIOLET
GREEN/BLACK
VIOLET/BLACK
A4AB4AC4AD4AB5AA5AC5AE5AF5AG5AH5AD5ARMT RAD_P1
FLOOR
GROUND
ANTENNA
RADIO
PD8C3417.FRM
Model 387 Schematics (46 of 59) SK30218 A 46
MAIN
POWER
SLEEPER
LOAD
CENTER
SLEEPER 2
3
298-8A , ORANGE
2
304-9C, RED
1
SLPR31
286-1C, RED
B252-1 , RED/BLACK
304-1D, RED239-32C, BLACK
S4
298-6D, ORANGE
86-2
30-2
85-2 87-2 87A-2
86-1 30-1
87-1 87A-1
85-1
16
22 23 24 25 26
18
17
19 20
252-2B, RED
252-1B , RED
A252-1B, RED
A252-2B , RED
226-3H, RED
3_IGN
239-29, BLACK
BAT_1 BAT_2
4_IGN
230-1H, ORANGE
239-34, BLACK
6_ACC
5_ACC
230-2F , ORANGE
262-2 , RED
7
27 28 29
33 34 35 36 37 38
31 32
30
S3
298-1E , ORANGE
SH 3
305-6A, RED
SLPR7
304-7C, RED
298-5D, ORANGE
298-4C , ORANGE
239-17E , BLACK
239-19, BLACK
S2S2
239-16G, BLACK
SH 4
298-2C, ORANGE
SPARE POWER SYSTEM EXPANSION SLEEPER
PD8C3417.FRM
Model 387 Schematics (47 of 59) SK30218 A 47
ENGINE
ECU
CAT
ENGINE
ECU
CUMMINS
464-1A , WHITE
577-2 , BLACK
577-1A , BLACK
455-1 , RED 455-2 , RED 455-1A , RED 455-2A , RED
576-2 , ORANGE
576-1 , ORANGE
197-1 , BLUE/RED
198-1 , BLUE/ORANGE
582-1 , RED/ORANGE
458-1 , BLUE
516-1 , PINK/BLUE
515-1 , YELLOW/BLUE
500-1 , BLACK/BLUE
498-1 , RED/ORANGE
499-1 , BLUE
A23-1 , RED
30-5A , ORANGE
30-2A , ORANGE
30-4A , ORANGE
30-3A , ORANGE
30-1B , ORANGE
533-1A , WHITE
239-2NN, BLACK
239-5Y , BLACK
239-3KK, BLACK
239-4CC, BLACK
239-1PP, BLACK
A
B
OEM HARNESS
SPEED
SENSOR
ENG13-B
S6
S5
S4
CUMMINS
S4
21
22
BLACK
BLACK
ORANGE
ORANGE
,
,
239-15J
30-7A,
30-6A,
239-14G
BLACK
ORANGE
ORANGE
,
576-2 ,
576-1 ,
577-1A
577-2 , BLACK
525-1 , BLUE/RED
526-1 , BLUE/ORANGE
INTERUPTER
OPTION
CAB61
CAB60
1
1
EE13-2, RED/ORANGE
ENG13-A
A
B
EE14-2, BLUE
SPEED
SENSOR
EE16-2, WHITE/RED
EE10-1, BROWN/WHITE
S1
EE23-1, GREEN/BLUE
EE12-1, BLACK/RED
EE24-1, LtGREEN
16 33 15
455-1B , RED
EE01-8, BLACK/WHITE
EE01-2, BLACK/WHITE
EE14-1, BLUE
EE13-1 , RED/ORANGE
E22-1, PINK
ENG
CAB LOAD CENTER
SH 5
ENG_3
ENG13
THROTTLE
PEDAL
CAT
RETURN
SIGNAL
A
POWER
C
B
C
F
A
E
B
D
D
B
E
C
F
A
THROTTLE
PEDAL
CUMMINS
SH 5
WHI TE
,
3-3
1
5
2
WHITE
,
457-4B , BLACK
3
4
ENGINE
STOP
WHI TE
WHI TE
533-1 ,
464-1 ,
BLACK
BLACK
,
,
, ORANGE
, ORANGE
, ORANGE
30-2B
577-2B
577-1C
576-1A
576-1B
SH 5
SH 5
S2 S2
SH 5
A281-2A
WHITE
, BLACK
WHI TE
457-5C
464-1A ,
S3
533-1A ,
CHECK
ENGINE
SH 10
BLACK
ORANGE
,
, BLACK
577-2A
577-1B
576-2A ,
SH 5
CATERPILLAR CUM MINS ENGINE
16 33 15
STOP
ENGINE
ENGINE
WARNING
CUMMINS
LIGHT BAR
ECU/TPS/SPEED/SENSOR/INTERUPT/WARNING LAMPS
PD8C3417.FRM
Model 387 Schematics (48 of 59) SK30218 A 48
MESSAGE
12
669, WHITE
670, LtGREEN
SPEEDOMETER
MESSAGE
CENTER
CAB44
239-51B, BLACK
239-54D , BLACK
239-52B , BLACK
239-53C, BLACK
SH 53
SH 53
SH 52
SH 52
253-22A, LtBLUE
253-23C, LtBLUE
253-21A , LtBLUE
SMC SELECT/RESET
9
7
3
2B
1
6
5B
4
10
8
SPEEDO MESSAGE CENTER (SMC)
PD8C3417.FRM
Model 387 Schematics (49 of 59) SK30218 A 49
CAB
LOAD
CAB FIREWALL CAB PANEL CAB FIREWALL
E
E
L
E
E
L
T
P
I
R
H
U
W
P
,
,
B
B
1
1
-
-
8
7
1
1
4
4
E
E
L
T
P
I
R
H
U
W
P
,
,
A
A
1
1
-
-
8
7
1
1
4
4
E
L
E
P
T
I
R
H
U
W
P
,
,
1
1
-
8
7
1
1
4
4
INTERFACE
MODULE
DMC4
P
R
U
P
,
2
7
1
4
A
AB
E
L
P
R
U
P
,
C
1
7
1
4
SH 35
B
E
T
I
H
W
,
C
1
8
1
4
T
I
H
W
,
2
-
8
1
4
SH 35
CAB18
DATA LINK
CONNECTION
CENTER
A
, PURPLE
417-1F
417-1G, PURPLE
B
ABS10
, WHITE
418-1F
418-1G, WHITE
ENG2
ABS ECU
DATA LINK
CENTER
ORANGE230-7A ,
PURPLE
PURPLE
, BLACK
,
,
,
239-64
418-4A
230-8A
417-4A
S14
S15
S12
ECU
ENGINE
E
T
I
H
W
/
E
U
L
B
,
1
1
5
552-1 , WHITE/BLUE
5
WHITE/BLUE
EE33-1, BLUE/WHITE
EE35-1,
"A"
REMOVE RESISTOR
21ENG4
ADD AUTO SHIFT
1 ABS82
A
B
ORANGE
,
X1-3
X1-1 , ORANGE/BLACK
X1-14 , PURPLE
X1-13 , WHITE
NONE
661,
ABC ABC
A BC
661-1E, YELLOW
A BC
ECU AUTO
SHIFT XMSN
YELLOW
,
662, GREEN
663
ENG19
CBA
CBA
BB1
A BC
GREEN
, YELLOW
663-1A, NONE
662-1A,
661-1A
662-1E, GREEN
663-1E , NONE
S10
BLACK
,
239-63
BLACK
239-2N,
S4
239-1Q, BLACK
BB2
C
B
A
ORANGE
, WHITE
418-3A
417-3A , PURPLE
WHITE
PURPLE
, ORANGE
418-2A,
417-2A,
230-2B
S2
S1
S3
ORANGE
, WHITE
,
417-1E, PURPLE
418-1E
230-1D
DIAGNOSTIC
INTERFACE
CONNECTION
CB
A
660-1 , NONE
BB4
C
C
B
AB
A
C
C
AB
A B
C
C
HDA3
J1939
C
C
B
BA
A
GREEN
YELLOW
,
,
662-1
661-1
663-1F , NONE
662-1F , GREEN
661-1F , YELLOW
663-1A, NONE
B
662-1A , GREEN
A
AB
661-1A, YELLOW
C
C
B
A
A B
YELLOW
661-1G,
, NONE
663-1G
662-1G, GREEN
BB3
C
CONNECTS T O "A"
B
A
C
C
C
B
A B
A
B
A
ABS8-A
C ABC
C
AB
A B
OPTIONAL AUTO SHIFT
CBA
ABC ABC
A
BC
660, NONE
662A, GREEN
661A, YELLOW
3 WAY
J1939
JUNCTION
TERMINATION
RESISTOR
USED AT OPEN NODES
ABS ECU
PD8C3417.FRM
Model 387 Schematics (50 of 59) SK30218 A 50
252-1 , RED
226-9 , RED
7
14
21
226-8 , RED
226-7 , RED
BLACK
BLACK
,
239-4K , BLACK
239-2P
239-3L ,
S1
22 23 24 25 26 27
28 29 30 31 32 33
226-6A, RED
226-5B, RED
226-4B , RED
34 35 36 37 38 39
40 41 42 43 44 45
230-6 , ORANGE
230-5 , ORANGE
230-4A, ORANGE
46 47 48 49 50 51
52 53 54 55 56 57
SPARE FUSE
POSITION
SPARE FUSE
POSITION
304-10 , RED
304-9 , RED
304-8 , RED
252-4 , RED
252-3 , RED
252-2 , RED
304-6 , RED
304-5 , RED
304-3A, RED
SPARE FUSE
POSITION
298-2 , ORANGE
298-3 , ORANGE
298-4 , ORANGE
298-5A, ORANGE
298-6 , ORANGE
298-7 , ORANGE
239-1R, BLACK
304-7 , RED
304-4 , RED
304-2 , RED
S4
.
S3
S2
298-1A, ORANGE
298-11 , ORANGE
304-11 , RED
252-5 , RED
239-48 , RED
SH 5
SH 4
CAB39
1
2
3
4
MAIN
POWER
CAB LOAD
CENTER
SH 5
B522-1 , RED/BLACK
B252-1C, RED/BLACK
SH 5
SH 5
286-1D, RED
ACCESSORY
, ORANGE
298-9
RELAY
IGNITION
RELAY
304-1 , RED
85-3 86-3
86-1
30-1
87A-1
85-1 87-1
86-230 -2
85-2 87-287A-2
87-3
123456
BLACK
,
SPARE CONN ECTIONS
239-7F
8 9 10 11 12 13
SPARE CONNECTIONS
15 16 17 18 19 20
ORANGE
239-JA , BLACK
298-10 ,
230-1E , ORANGE
230-2C , ORANGE
230-3B , ORANGE
SPARE CONNECTIONS
A252-3 , RED
A252-2 , RED
A252-1 , RED
226-1J , RED
226-2D, RED
226-3D, RED
CAB2
CAB SPARE POWER SYSTEM EXPANSION
PD8C3417.FRM
Model 387 Schematics (51 of 59) SK30218 A 51
CAB
LOAD
CBSP-2A, BROWN/GRAY
CBSP-2A, BROWN/GRAY
CBSP-1A, WHITE/GRAY
A252-2A, RED
239-2CC, BLACK
CBSP-1A, WHITE/GRAY
239-2CC, BLACK
A252-2A, RED
CENTER
RADIO/
CB
HEADER
CBSP-1, WHITE/GRAY
CBSP-2, BROWN/GRAY
HDR10
A
B
CB
SPEAKER
CB RADIO
LH
ANTENNA
RED
WHITE/GRAY
BROWN/GRAY
CB RADIO
BLACK
RH
ANTENNA
PD8C3417.FRM
Model 387 Schematics (52 of 59) SK30218 A 52
CAB LOAD CEN T ER
CAB14
CAB PANEL
21 10
7
CAB53
HVACCAB
FIREWALL
7
CAB15
RADIO/CB ENGINE
C7
29
37 PIN
DOOR PWR
45 30
C8
LIGHT BAR
25 PIN
SLEEPER
1
DMC6
DMC5
6
-
1
3
5
3
2
1
CAB19
3
21
123
T
D
H
E
W
PANEL
R
LP
DIMMER
CONTROL
253-19 253-18
PIN
1
1
E
U
L
B
t
L
,
E
2
3
5
2
CIGAR
LIGHTER
POWER
CIGAR
LIGHTER
POWER
CAB37
CAB38
PIN
CAB30
253-24A
G
M
1
3
5
HVAC CNTRL
2
HEAD
9
CAB30
FLOOR LP
SWITCH
253-1J , LtBLUE
253-20A
253-1
SH 35
253-2J
8
DOOR3
DOOR3
8
253-1N
S1
253-2H
DOOR46DOOR6
RH POWER
WINDOW
253-3E
6
DOOR
LOCK
253-1P
S3
DOOR6
253-4C
9
HTD
MIRROR
SW
6
DOOR4
RH POWER
WINDOW
253-3F
8
DOOR4
DOOR4
253-3G
253-2 253-3 253-4 253-5
9
ENG10
CRUISE
ON/OFF
SWITCH
253-2G 253-3D 253-4B 253-5 253-7A
9
CAB11
CAB11
HEAD LAM P
SWITCH
8
253-1Q
S4
DOOR5
253-3H
4
LH POWER
WINDOW
9
ENG9
CRUISE
SET/RESUME
SWITCH
9
CAB12
CLEARANCE
LP-SWITCH
LIGHT BAR30SLEEP L/C
1
SLPR2
10 15
253-4D
2
DOOR6
DOOR
LOCK
9
ENG8
ENGINE BRAKE
SELECTOR
SWITCH
9
CAB13
PASS SIGNAL
SWITCH
253-10C
G
SLPR27
HVAC CON TRO L
HEAD
SLEEPER
9
ENG7
ENGINE BRAKE
ON/OF F
SWITCH
9
CAB16
FOG LP
SWITCH
253-1R
9
SLPR14
REFER SW ITC H
ON/OFF
9
ENG12
DIAGNOSTIC
SWITCH
9
CAB17
ENGINE
FAN SWITCH
CAB20
SPOT LP
SWITCH
BACK LIGHTING +12 VOLTS
253-2K
9
SLPR17
FL LP SWITCH
253-8A 253-9B
9
9
CAB21
EITHER
SWITCH
9
CAB22
SLEEPER
LP SWITCH
253-10C
9
CAB43
10
SMC
SELECT/RESET
SWITCH
9
253-16A
1
2
3
5
2
253-11A
S6
253-12A
253-13A
253-14
253-15A
5
2
3
5
2
CAB28
DIFF LOCK
SWITCH
9
CAB23
TWO SPEED
AXLE SWITCH
9
CAB24
INNER AXLE
SWITCH
9
CAB25
FIFTH WHEEL
SW SWITCH
9
CAB26
SPARE SWITCH
9
CAB27
DIFF LOCK
PTO SWITCH
A
CAB62
ASHTRAY
9
CAB45
253-22
253-23
LOAD LP
SWITCH
PD8C3417.FRM
Model 387 Schematics (53 of 59) SK30218 A 53
239-5V , BLACK
K
K
C
C
A
A
L
L
B
B
,
,
P
P
6
8
-
-
9
9
3
3
2
2
2
1
3
-
-
-
6
6
5
8
8
8
CAB 2
CAB LOAD CEN TER
K
K
C
C
K
A
A
C
L
L
A
B
B
L
B
,
,
D
D
,
D
D
Y
2
3
-
-
4
-
9
9
9
3
3
3
2
2
2
4
2
7
-
211
6
8
CAB14
CAB LOAD
CENTER
HEAD LAMP SW ITCH
239-63A , BLACK
E
CAB56
DIAGNOSTIC CONNECTION
HDA1
E
K
C
A
L
B
,
E
E
2
9
3
2
A
HDA2
K
C
A
L
B
,
F
F
1
9
3
2
S1
CAB LOAD CTR
3
K
K
C
C
A
A
L
L
B
B
,
,
J
R
9
8
-
9
9
3
3
2
2
8
CAB11
SH 4
4
37
K
C
A
L
B
,
B
8
4
9
3
2
CAB39
K
C
A
L
B
,
H
0
1
9
3
2
K
C
A
L
B
,
B
7
4
9
3
2
1
CAB10
WIPER SWITCH
8
CLEARANCE LAMP SWITCH
K
C
A
L
B
,
K
2
1
9
3
2
K
C
A
L
B
,
F
3
1
9
3
2
CAB12
37
K
C
A
L
B
,
F
4
1
9
3
2
65
PASS THRU
WIRE1724, BLACK
5
S10
K
C
A
L
B
,
A
4
6
9
3
2
13
CAB15
CAB LOAD CENTER
CAB
LOAD CENTER
CAB54
OUTLET
K
C
A
L
B
,
A
6
4
9
3
2
CAB1
K
C
A
L
B
,
F
5
1
9
3
2
8
CAB13
PASS SIGNAL SWITCH
239-1GG, BLACK
1
ENG11
CAB LOAD CENTER
CAB
LOAD CENTER
CAB15
CAB
FIREWALL
4
K
C
A
L
B
,
A
5
4
9
3
2
239-44A , BLACK
1
CAB36
K
C
A
L
B
,
D
6
1
9
3
2
37
12
K
K
C
C
A
A
L
L
B
B
,
,
A
A
239-41A , BLACK
9
0
3
4
-
-
9
9
3
3
2
2
7
8
CAB30
FLOOR LAM P
SWITCH
1
CAB35
K
K
K
C
A
L
BLACK
B
,
C
7
1
9
3
239-18C ,
2
58
K
C
C
C
A
A
A
L
L
L
B
B
B
,
,
,
B
B
A
9
0
1
1
2
-
-
2
-
9
9
9
3
3
3
2
2
2
8
37
CAB16
FOG LAMP SWI TCH
S8
K
C
A
L
B
,
A
3
4
9
3
2
8
CAB32
LH FLOOR LA M P
K
C
A
L
B
,
C
2
2
9
3
239-23A , BLACK
2
8
7
CAB17
ENGINE F AN SWITCH
K
C
HVAC CONTROL
A
L
B
,
A
2
4
9
3
2
8
CAB31
RH FLOOR LAMP
K
K
K
C
C
C
A
A
A
L
L
L
B
B
B
,
,
,
D
C
B
5
6
7
2
2
2
-
-
-
9
9
9
3
3
3
2
2
2
37
CAB20
STOP LAMP SWITCH
2
CAB46
HEAD HEAD
NEGATIVE SW ITCH LINKS
BLACK
,
239-2FF
239-3EE, BLACK 239-4Z , BLACK 239-5W, BLACK
8
7
ENG10
CRUISE ON/OFF SW
7
ENG9
SET/RESUME SWITCH
7
ENG8
ENG BRAK E SELECTO R SW
239-62A , BLACK
SH 4
K
C
A
L
B
,
A
8
2
9
3
2
7
CAB21
EITHER SWITCH
ENGINE BRAKE ON/
D
AC MODULE
239-57A , BLACK
K
C
A
L
B
,
B
9
2
9
3
2
7
SLEEPER FLOOR
LAMP SW IT CH
, BLACK
239-6Q
239-7P , BLACK
8 7
ENG7
239-60A , BLACK
CAB52
HVAC CONTROL
HEAD
CAB22
DIAGNOSTIC SWITCH
CAB
LOAD CENTER
CAB53
HVAC
23
HVAC CONTROL
D
CAB47
239-30A , BLACK
7
ENG12
5
K
C
A
L
B
,
A
8
5
9
3
2
C
CAB48
239-59A , BLACK
K
C
, BLACK
A
8
3
239-51
239-36A , BLACK
239-65 , BLACK
C
CAB50
HVAC CONTROL HEAD
A
L
BLACK
B
,
,
239-32B , BLACK
9
3
2
239-37A
S5
239-33A , BLACK
239-34A , BLACK
239-35A , BLACK
K
K
C
C
A
A
L
L
B
B
,
,
2
3
5
5
-
-
9
9
3
3
2
2
27
8
CAB43
SELECT/RESET SWITCH
C
CAB28
DIFF/LOCK/PTO SWITCH
239-50A , BLACK
C
CAB23
TWO SPEED AXLE SWITCH
239-51A , BLACK
C
CAB24
INTER AXLE SWITCH
C
CAB25
SPARE SWITCH
C
CAB26
SPARE SWITCH
C
CAB27
SPARE SWITCH
B
CAB62
ASHTRAY
K
K
K
C
C
C
A
A
A
L
L
L
B
B
B
,
,
,
C
B
B
6
5
4
5
5
5
-
-
-
9
9
9
3
3
3
2
2
2
8 27
CAB45
LOAD LA M P S WITCH
B
PARK BRAKE SWITCH
A
RH DOOR SWITCH
BLACK
239-49A ,
SELECT/RESET SWITCH
A
CAB42
LH DOO R SW ITCH
8 27
CAB43
CAB29
CAB41
K
C
A
L
B
,
A
2
5
9
3
2
K
C
A
L
B
,
A
3
5
9
3
2
K
K
K
C
C
C
A
A
A
L
L
L
B
B
B
,
,
,
C
C
B
5
4
3
5
5
5
-
-
-
9
9
9
3
3
3
2
2
2
8
27
CAB45
LOAD LAM P SW ITCH
PD8C3417.FRM
Model 387 Schematics (54 of 59) SK30218 A 54
S6
S5
SHEET
S2
S3
S7
S7
S12
S1
S5
(GREEN/BLACK)
227-3A
227-4A227-2B
(YELLOW/BLACK)
228-5A
228-4A
228-3A
(BLACK)
577-1
239-17
239-15B
239-3N
239-4L
A239-RH
239-14H S H 13
(BROWN)
8-3C
8-4C
(RED)
397-2
(RED)
226-14A
(ORANGE)
(BLACK)
239-47A
239-48A
239-5J
(BLACK)
239-38B
239-34B
239-35B
239-36B
239-37B
239-39B
SH 10
SH 10
SH 13
SH 13
SH 10
SH 10
SH 47
SH 4
SH 4
SH 22
SH 4
SH 13
SH 12SH 12
SH 6
SH 39
SH 13
SH 40
SH 39SH 20
SH 40SH 40
SH 39SH 40
SH 39SH 48
LOAD CENTER
CHASSIS
SH 10
SH 10
227-1F 227-5A
SH 10
228-2B
SH 10
SH 47
SH 17
SH 13
SH 12
SH 12 SH 12
SH 40 SH 40
SH 40 SH 40
SH 49 SH 49
SH 50 SH 5
SH 50 SH 50
SH 50 SH 50
SH 50
SH 25
SH 25
228-1F
DISTRIBUTION
557-2
239-11E
SH 4
239-1S
SH 4
239-10D
SH 3
239-6G
A239-LH
8-1D
SH 6
SH 6
397-3
397-1
MAIN CAB HARNESS
226-10 226-12A
226-11A 226-13A
230-7 230-8
239-1T
239-2Q
239-3P
239-4M
239-49B
239-50B
239-30B
239-32D
239-33D
239-51C
SEE GROUND
8-5C
8-2C
SH 50
252-1A
SH 50
252-2A
SH 50
252-3A
SH 52
253-10
SH 52
253-21B
SH 50 SH 50
298-1B
SH 50 SH 50
298-10A
SH 50 SH 50
298-11A
SH 50 SH 50
298-2A
SH 50
304-1A
SH 50
304-10A
SH 50 SH 50
304-11A
SH 50 SH 50
304-2A
304-3B
SH 49 SH 49
SH 25
SH 49 SH 49
SH 49 SH 49
SH 21
SH 21
SH 21
SH 21
SH 9
SH 9
SH 9
SH 9
329-1C
342-1A
342-2A
342-3A
570-2A
FRL-4A
239-43B
S4
S6
S2
S3
S10
S11
S13
S15
S14
S16
S9
S8
(RED)
252-4A
253-5A
(LtBLUE)
(ORANGE)
(RED)
304-6B
(BLACK)
239-63B239-64B
(PINK/GREEN)
329-2C
329-3C
(YELLOW/WHITE)
(PURPLE)
417-4417-3
(WHITE)
418-4418-3
(YELLOW/WHITE)
570-3A
570-4A
(RED/BLACK)
FRL-3AFRL-1A
(BLACK)
239-41B239-42B
253-13B
253-15B
253-12B
253-14A
253-11B
253-16B
298-3A
298-4A
298-5B
298-6A
298-7A
304-4A
304-5A
304-7A
304-8A
304-9A
342-4A
342-5A
SH 50
SH 50
SH 52
SH 52
SH 52
SH 52
SH 52
SH 39
SH 50SH 50 298-9A
SH 50
SH 50
SH 50
SH 50SH 50
SH 25
SH 25
SH 9
SH 9
SH 9
SH 9
SH 21
SH 21
HOOD HARNESS
SH 4
239-1U
SH 10
239-11F
SH 13
239-6H
SH 12
239-7G
SH 13
239-10E
SH 12
239-9D
SH 14
7-3C
SH 12
8-3D
8-4D
SLEEPER HARNESS
239-19
SH 34
SH 46
239-16A
SH 46
239-17A
SH 34
239-18A
SH 46
239-19
SH 46
SH 46
298-2B 298-6B
SH 46
298-4B 298-8
SH 46
304-9B
SH 46
305-6
SH 36/3 7 SH 36/3 7
SH 36/3 7 SH 36/3 7
SH 36/3 7 SH 36/3 7
SH 36/3 7 SH 36/3 7
X5-3 X4-3B
S2
S3
S5
S2
S3
S4
ABS CAB
S1
S2
(BLACK)
239-2R
239-3R
S1
239-4N
239-5K
(BLACK)
239-12C
239-8F
(BLACK)
(PURPLE)
7-1B
S6
7-2C
(BROWN)
8-1E
S4
8-2D
(BROWN)
8-5D
S5
8-6A
(BLACK)
239-35
239-34
(BLACK)
239-25B
239-26B
239-32A
(ORANGE)
298-5C298-1C
(RED)
304-1B
304-3C
304-7B
(GREEN/YELLOW)
X3-9BGND-AAA
(GREEN/YELLOW)
X2-3BGND-BA
X5-12X4-12B
SH 17
SH 17
SH 16
SH 14
SH 14
SH 14
SH 12
SH 12
SH 12
SH 12
SH 46
SH 46
SH 34
SH 34
SH 46
SH 46
SH 46
SH 46
SH 46
SH 46
SH 46
SPLICE LOCATION
DOOR CONTROL
(VIOLET/WHITE)
SH 25 SH 25
SH 23 SH 23
SH 24 SH 24
SH 43
SH 24 SH 24
SH 24
SH 43
SH 43 SH 23
SH 43 SH 43
SH 4 SH 4
239-13C
239-14C
SH 2
239-10F
SH 11 SH 11
S5
19-1E19-3B
19-2C
(RED)
S8
226-1K
230-1F
230-5A
239-4P
239-6J
253-4F 253-3B
253-2S 253-1V
302-3A
239-3T
239-5M
239-7H
239-9E
269-1B 269-2A
8-3F
226-2E
226-3E
(ORANGE)
S2
230-2D
230-3C
(BLACK)
S1
239-1V239-3S
(LtBLUE)
S3
(BROWN/YELLOW)
S4
302-1B
302-2A
CHASSIS HARNESS
(BL ACK)
S4
239-1W239-2T
(BL ACK)
S2
239-4Q
(BL ACK)
S1
239-6K
(BL ACK)
S5
239-15C
(BL ACK)
S3
239-8H
(BL ACK)
S10
239-16B
(BL ACK)
S9
239-11G
(PINK/WHITE)
S8
269-3A
(BRO WN)
S6
8-2E
8-1F
(BRO WN)
S7
8-4F
8-5E
SH 25
SH 23
SH 24
SH 23SH 23
SH 43
SH 17
SH 17
SH 6
SH 17
SH 4
SH 4
SH 11
SH 12
SH 12
SH 12
SH 12
DISTRIBUTION
PD8C3417.FRM
Model 387 Schematics (55 of 59) SK30218 A 55
COWL
SH 7 SH 6
SH 8
SH 25
SH 43
SH 25
SH 24
SH 24
SH 23
SH 23
SH 24
SH 43
SH 25
SH 24
SH 23
SH 23
SH 43
239-3V 239-1X
239-5P
239-1Y 239-3W
239-2V 239-4S
253-1W 253-2T
LOCK1A-1A LOCK1A-3A
LOCK2A-1B LOCK2A-3A
LH DOOR
226-4C 226-1L
226-5C
230-3D
239-3X
239-4T
253-1X 253-3N
665-2A 665-1C
S1
239-2U239-4R
DOOR RH
S2
239-5Q
S1
S4
LOCK1A-2A
S3
LOCK2A-2A
S1
226-2F
226-3F
S3
230-1G230-2E
S5
S4
S2
(BLACK)
(BLACK)
(LtBLUE)
253-3M
(GRAY/BLACK)
(BLACK/GRAY)
(RED)
(ORANGE)
(BLACK)
239-1Z239-2W
239-5R
239-6L
239-7K
(LtBLUE)
253-4G253-2U
(WHITE/TAN)
665-3A
SH 6SH 6
SH 23
SH 24
SH 25
SH 23
SH 24
SH 24
SH 24
SH 24
SH 24
SH 23
SH 21
SH 23
SH 24SH 24
SH 24
SH 24
SH 24
SH 43
SH 24
SH 24
SH 43
SH 43
CUMMINS ENGINE
239-14E 239-1AA
SH 47
239-10G
SH 4
SH 5 239-13
SH 47
239-6M
SH 4
SH 47
SH 47
SH 47
SH 44
SH 47
SH 12
SH 4
SH 4
30-6
ENGINE DASH
EE01-1A EE01-3A
SIDE REPEATER
8-1G 8-2F
239-1BB 239-2Y
TRAILER HARNESS 7-WAY
239-2Z 239-1CC
S3
239-3Y
239-4U
S2
239-11H
239-12H
239-13E
S4
239-2X239-15D
239-5S
S1
239-7L
239-8J
S5
30-130-3
30-730-4
S6
30-2
30-5
S1
EE01-8AEE01-2A
S1
8-3G
S2
239-3Z
S1
239-3AA
(BLACK)
(BLACK)
(BLACK)
(ORANGE)
(ORANGE)
(BLACK)
(BROWN)
(BLACK)
(BLACK)
SH 47
SH 47
SH 47
SH 9
SH 11
SH 44
SH 47
SH 47
SH 4
SH 4
SH 47
SH 47
SH 47
SH 47
SH 44
SH 47 (CAT ONLY)
SH 12
SH 12
SH 10
SH 10
SH 4
SH 4
DISTRIBUTIONSPLICE LOCATION
SH 4
SH 4
239-4F
SH 5 239-13
SH 8
239-8K
239-9G
239-10M
457-7A 457-1B
SH 44
SH 55
SH 44
SH 41
CAT ENGINE
S1
S2
S4
S3
457-2
239-1DD239-2AA
239-3BB
239-5T
239-6N
239-7M
457-8A
457-5A457-4
SH4
SH 4
SH 9
SH 11
SH 44
SH 44
SH 47SH 41
PD8C3417.FRM
Model 387 Schematics (56 of 59) SK30218 A 56
S6
S5
253-25A , LtBLUE
239-65A , BLACK
ASHTRAY
BA
CAB62
ASH TRAY
PD8C3417.FRM
Model 387 Schematics (57 of 59) SK30218 A 57
ICC LIGHT
HDR2 THRU HDR6
DOME LAMPS
HDR7, HDR8, AND HDR9
SPOT LAMPS
HDR12, HDR12
SPARE CIRCUIT
BLOCK CAB2
FIREWALL
CONNECTION CAB1/CLC7
GROUND STUD
FIREWALL CLC 9
RH HEAD LAMP
CONNECTION HOOD 3
ENGINE HARNESS
CONNECTION CLC2/ENG3
LH HEAD LAMP
CONNECTION HOOD 2
AXLE GROUND
SENSOR CONNECTION
LH FUEL TANK
SWITCHES
CAB 11 THRU CAB 22
POWER OUTLET
HOOD HARNESS CONNECTION HOOD 1/CLC1
ON DASH
CONNECTION
STOP LAMP SWITCH CONNECTION HOOD 14
AND TEMP
TAIL LAMP
CONNECTION CH ASS11
CONNECTION HOOD 12
PD8D3417.FRM
Model 387 Schematics (58 of 59) SK30218 A 58
READING LAMP
CONNECTION
FL LAMP
CONNECTION
POWER OUTLET
MAIN POWER
CONNECTION
LOAD LAMP
CONNECTION
READING LAMP
CONNECTION
CONTROL PANEL
CONNECTION
BUNK LAMP
CONNECTION
SPARE CIRCUIT
REFRIGERATOR
CONNECTION
SLPR15 OR SLPR16
CONNECTION
PD8D3417.FRM
Model 387 Schematics (59 of 59) SK30218 A 59
789
2B
3
1
6
4
5B
CAB SPAR E POW ER
5 AMPS
2
1
HTL2
HTL1
226-1AB, RED
239-1AB, BLACK
383-1 , BLUE
10
HOT LINE SWITCH
1 2735610894
E
U
L
B
t
L
,
B
A
1
383-2 , BLUE
3
5
239-3AB , BLACK
2
253-2AB, LtBLUE
CIRCUIT BREAKER
60 AMPS
2
1
239-2AB, BLACK
383-1AB, BLUE
239-1AC, BLACK
HTL1-SC1
BA
A B
HTL1-SC2
383-1AC, BLUE
239-1AD, BLACK
FUEL HOT LINE
HTL3
1
1
BACK LIGHTING
HTL4
1A, RED
86
30
SOLENOID
87
85
239-AE, BLACK
1
HOT LINE HEATER
2
1, RED
CROSS MEMBER
SH3
PD8D3417.FRM
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