Peterbilt 379 wiring diagrams
R
Model 379 Family Wiring (before 7/94)(1 of 2) SK19517 M 01
RH SPEAKER
LH SPEAKER
RADIO
RH LOAD LT
LH LOAD LT
AD LIGHT
AUX FAN
RH SPOT LT
LH SPOT LT
ALARM TAP
RH DOOR LT
RH DOOR SW
CTR ROOF LT
LH DOOR SW
LH DOOR LT
RH CLR LGHT
RH I D LGHT
CTR I D LGHT
LH I D LGHT
LH CLR LGHT
C B
TURN
MARKER
RH
LAMP
HIGH
ASSY
LOW
HIGH
HIGH
HIGH
LH
LOW
LAMP
ASSY
MARKER
TURN
RH POLE LT
H3
LH POLE LT
RH DR/FOG LT
LH DR/FOG LT
ELECTRIC HORN
FREON HSLP SW
FREON HSHP SW
H1
FREON LSLP SW
K
FAN SOLENOID
FREON HSFO SW
H2
ENGINE BRAKE OPTIONS
RADIATOR SHUTTER OPTION
NO
KYSOR WATER
C
TEMP OPTION
NC
WATER T EMP GUAG E
OPTION
ETHER
FUEL SOLE NOID
ENGINE OIL TEMP
MAIN TRANS
TEMP OPTION
SPARE CIRCUITS
FREON COMPRESSOR CLUTCH
FAN CLUTCH TEMP SW
LOW WATER WARNING
OPTION
SOLENOID (W/O
239
STD STARTER)
29
A29
A30
ALTERNATOR
31
CIRCUIT
BREAKER
239
239
FRAME
GRD
ENGINE
GRD
432
436
434
430
430
434
436
432
437
433
431
435
252
239
19
249
249
254
229
132
19
19
132
389
329
19
239
389
329
19
239
19
329
389
329
19
329
19
239
5
239
5
239
5
239
5
239
5
239
19
239
348
227
239
8
41
239
42
42
239
41
8
239
228
8
8
7
7
243
180
A180
A180
B180
B180
570
220
220
242
225
224
223
289
191
285
231
232
380
83
A23
282
59
E1
E2
93
242
220
242
A98
239
239
29
A29
A30
A30
A29
298
MAIN CAB
POWER
30
+
STARTER
S
-
ENGINE
HARNESS
BLANK
437 437
433
431
389
429
239
19
248
249
248
249
254
252
229
132
429
239
19
329
5
348
ROOF
HARNESS
FIBER
OPTIC
LIGHT
ENGINE
BRAKE
OPTION
E
CRUISE
CONTROL
HOOD
HARNESS
227
239 239
8
41
42
42
41
228
7
243
180
570
220
242
A6
225
224
223
289
191
285
231
232
380
83
A23
282
59
E1
E2
93
242
220
A98
239
29
-+-+-
+
BLANK
433
431
435435
389
429
239
19
248
249
254254
SLEEPER
JUMPER
HARNESS
248
249
254
A252
229
132
429
239
19
329
5
348
BLANK
SPARE
SPARE
BAR
SPARE
SPARE
SPARE
16-WAY CONNECTOR
SPARE
BUZZER
SPARE
SPARE
LIGHT
18-WAY CONNECTOR
SPARE
SPARE
SPARE
SPARE
MAIN CAB
HARNESS
227
8
41
42
42
41
228
7
243
180
570
220
242
225
224
223
289
191
285
231
232
380
83
A23
282
59
E1
E2
93
242
220
A98
239
29
BATTERIES
MAIN CAB
HARNESS
239
253
225
224
223
289
242
305
98
106
419
192
285
242
302
228
227
TEST
TEST
42
438
145
239
220
249
354
132
239
354
MAIN CAB
HARNESS
AIR START
SPEEDO
SENSOR
SPARES
C3
SPOT
SWITCH
LIGHT
ENG FAN
A1
FUEL
SWITCH
LEVEL
SHUTDOWN OVERRIDE
AD/LOAD
SWITCH
LIGHT
29
AUX
SWITCH
LIGHT
CLEARANCE
SWITCH
LIGHT
SWITCH
HEADLIGHT
ENG CHECK LIGHT
419
ENG STOP LIGHT
438
SPARE
SPARE
SPARE
90
TWO SPD
AXLE OPT
SPEEDO
197
239
TACH
DAYTIME
RUNNING
LIGHT
OPTION
MIRROR
SWITCH
HEAT
SWITCH
SWITCH
ETHER
PANEL
LIGHT
DIMMER
REAR
DRIVER
TEMP
FRONT
DRIVER
TEMP
SPARES
A2
WATER
TEMP
OIL
TEMP
OIL
PRESS
324
TACH
SENSOR
239
INSTR LIGH T POW ER
DRL
MODULE
PARK BRAKE SW
SWITCH
280
249
106
FUSE
HOLDER
20A
41
42
242
239
29
298
328
239
328
SPARE
CIRCUTS
280
132
2
14
1
27
7
239
B8
298
24
239
B8
E
TRANS
TEMP
AIR
PRESS
106
285285
DUAL
AIR
PRES
FUEL
LEVEL
VOLTS
MAN
PRESS
INSTR GRDS
INSTR POWER
GROUND
CONSTANT POWER
TRAILER
CONSTANT POWER
SWITCHED POWER
303
302
226
220
232
23
254
29
83
WIPER/
WASH SW
239
A5
239
B8
253
WHITE
13
RED
AUX TRANS TEMP
GLOW PLUG
AIR
APP
FUEL
RESTRICT
PYRO
START
BUTTON
ETHER
298
298
41
42
242
239
29
298
328
239
328
VARASHIELD
CLOCK
239
280
AUX
230
226
404
242
398249
402
239
397
397
403
404
241
35
36
59
242
239
253
280
83
IGN
226
SW
12
286
23
252
253
242
239
14
380
280
282
253
242
239
286
29
83
226
A2
239
253
242
G2
SERVICE ONLY
RELEASE NO.
91045
E.P.C. NO.
DATE
12-09-93
G.A.MARSHALL RTM
BY
298
AUX
66
5
8
228
279
AUX
227
227
8
279
66
TRAILER
PLUG
MAIN CAB
HARNESS
AUX
5
228
279
AUX
5
228
279
2278227
8
66
TRAILER HARNESS
5
228
302
227
5
239
239
5
228
302
239
239
253
253
239
280
280
253
239
180
45
191
404
239
239
403
402
398
397
283
281
A39
228
227
38
37
A8
8
281
279
3
192
242
145
239
305
305
239
106
231
23
A39
39
239
239
239
286
304
A298
CIRCUIT
BREAKER
E1
E2
230
230
226
226
226
239
232
A98
98
29
A23
23
M
HEAT
TURN LGHT
CLR LGHT
GROUND
GROUND
CLR LGHT
TURN LGHT
HEAT
GROUND
GLOVE BOX LT
CIG LIGHTER
LT
280
FUSE HOLDER
HORN BUTTON
C2
STOP
LT
5TH WHL
DIFF LOCK
LOW AIR
LOW AIR
OIL
KYSOR OPTIONS
E
FLASHER
GROUND
SHUTDOWN RELAY GRD
MAIN
ACC RELAY
A3
#5
#4
SPARE CIRCUTS
#3
#2
#1
SPARE RH TURN LT
ENGINE SHUTDOWN/
SPEED LIMITER/
ENGINE WARNING
OPTIONS
RH MIRROR
OPTIONS
LH MIRROR
OPTIONS
CIGAR
LIGHTER
A6
D2
HEAT
& A/C
WINDSHIELD
WASHER
WIPER
MOTOR
TURN SIGNAL
SW
PRESS
SW
F
SEE SH 2 FOR REV
437
433
431
435
389
429
239
248
249
254
SLEEPER
JUMPER HARNESS
AUX HEATA/C CNTRL
AUX
HEATA/C
AD LT
RH LOAD LT
LH LOAD
LT
G1
H6
269
8
38
37
239
LH LAMP
STOP/TAIL/BACK
227
228SPARE LH TURN LT
MAIN CA B
HARNESS
228
227
241 241
281
437
433
431
435
389
429
239
1919
248
249
254
SLEEPER
HARNESS
239
248
240
212
153
152
152
153
212
240
248
239
239
42
41
A8
283
243
G1
230
570
A252
252
CHASSIS
HARNESS
228
227
3737
88
3838
242242
2
2
1
1
3535
3636
239239
5
5
SK19517
437
RH SPEAKER
A433
A433
SPEAKER
433
VOL CONTROL
431
A431
A431
LH SPEAKER
435
429
FUSE H OLDER
429
429
239
239
19
A19
239
19
A19
239
19
A19
239
19
239
19
239
19
239
19
239
239
BULB
25 25
4
28
SPARE
J
19
19
239
239
329
329
389
19
19
389
329
329
239
45
303
242
226
248
PNLLPSW
ACC
MIR
HEAT
HEAT
A/C
SLPR
SPARE
#3
13
304
239
41
C1
4
CL LPS
LEFT
RIGHT
42
5
A4
A5
A8
239
28
A/C
45
HORN
MARKER LPS
D1
B8
8
A5
93
DEF
FAN
HORN
UNSW
ROOF
TURN
#4
SPARE
#5
230
19 230
39
229
280
269
8
37
239
RH LAMP
STOP/TAIL/BACK
8
269
239
269
242
242
242
239
2
239
1
239
35
239
36
239
241
5
5
254
249
249
8
239
LIGHT
329
298
RADIO
230
269
8
37
239
429
ACC POWER CONN
OVERHEAD
FLUORESCENT LT
LH GENERAL LTS
RH GENERAL LTS
ACC GROUND
READING LT
READING LT
RH BAG
COMP LGHT
RH DR SWTCH
LH DR SWTCH
LH BAG
COMP LGHT
226
226
397
SPARE
SW
WIPER
SPARE
28 4
TAIL
298 24
3 124
STOP
304
CB
DR
FOG
CL
ACC
3482725
LIC PLATE LAMP
(OPTIONAL)
BACK-UP ALARM
(OPTIONAL)
BACK-UP LIGHT SW
FUEL FILTER
AIR DRYER
FRONT DRIVER
TEMP SENDER
SPARE MARKER LT
ACC POWE
OVERHEAD LT SW
DOME LIGHT
226
SPARE
#1
#2
CIRCUIT
BREAKER
PANEL
RT HD
LP
IGN
LT HD
LP
29824
LPS
SLPR
429
RIGHT
FUEL TANK
LEFT
FUEL TANK
REAR DRIVER
TEMP SENDER
AUX TRANS
TEMP SENDER
H4
PD803001.FRM
Model 379 Family Wiring (before 7/94)(2 of 2) SK19517 M 02
fs
MS
MFT
A
LEM
JJX
B
MNH
AER
C
LED
DHJ
D
LDH
AER
E
VNT
AER
F
RS
JJX
G
NDP
GEN
H
GEN
EDH
J
EDH
GEN
K
GEN
LVR
MS
MS
GHW
RG
MS
MS
MS
MS AJC
MS
ROC
1) CKT 226 TO ENG
G-7
FAN SW WAS 242
2) CKT 226 TO OIL
VAR
& WATER TEMP WAS
242
3) ADDED CKT BRKR &
C-3
CKT A298
4) CKT A4 TO RT
D-1
RELAY WAS 42
5) CKT 230 TO HORN
D-2
WAS 280
6) CKT 93 WAS 180
VAR
7) REMOVED TRINARY
C-8
SW & RELAY
C-8
8) ADDED LOW PRESS
SW & ENG FAN
CYCLE SW
9) ADDED SH 2
1) ADDED CKT 389VAR
2) QAC WAS 4B-4
ROC
1) A8 TO L & R
D-2
HEADLIGHT RELAYS
WAS A4
2) 8 TO TURN SIGNAL
F-3
SW WAS 4
3) ADDED DAYTIME
A-7
RUNNING LIGHT
WIRING
ROC
1) ADDED A/C RELAY
D-1
G-3 2) ADDED CKT 180
REVISED TO WORKVAR
WITH THE NEW 28FUNCTION LIGHT BAR
ADDED GROUND 239C-3
AJC
1) ADDED RELAYS FORVAR
MKR & CLEARANCE
LAMPS
2) RMV NOTESH-4
1)ADDED FREON HSHPD-8
SW TO HOOD HARNESS
2)RELOCATED FAND-8
SOL ENOID , FRE ON
HSLP SW, & FREO N
HSFO SW TO HOOD
HARNESS
3)ADDED RH & LH POLED-8
LT TO HOOD HARNESS
4)ADDED CKT’S 227 &C-1
228 TO CH ASSIS
HARNESS
5)ADDED CKT’S 570 &VAR
A180
6)CKT 570 TO A/CD-2
RELAY WAS CKT 180.
CKT 180 REROUTED
TO HOOD HARNESS
REVISED TAIL LIGHT
WIRING
C-1
AJC
ADDED LSLP SWITCH
D-8
01-16-89
35543-03
08-09-89
11991RG
09-22-89
89053-03RG
02-06-90
36269-02
02-27-90
12133RG
08-23-90
12266JJS
02-08-91
91018-02BAK
07-19-91
37338-05LVR
04-16-92JHO
12631NRG
12-07-92
37946-07JRL
GAM
GNB
11-08-93
91045-27JRL
GJR
VAR
RESTORED TO REV K
(PRE R134A)
M
GAM REM
DPH
JEP
L
DPH
D-6
A-5
D-1
E1
VAR
D-7
B-7
H-7
C-7
B2
1) ADDED SPARE 242
& 239
2) MOVED DRL FUSE TO
DILL BLOX
3) REPLACED A/C
RELAY W/ A/C
& DRL FUSEFUSE
4) REVISED DILL BLOX
LABEL FOR HTR FUSES
5) REDESIGNED HTR A/C
WIRING
6) ADDED A/C AND
FIREWALL HARNESS
7) REMOVED CKT 191
8) ADDED CKT 494, 495
9) REMOVED CKT 180
FROM HOOD HARNESS
04-20-94
13062
SK19517
PD803001.FRM
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