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CAT C10/C12, 3176B, 3406E Engine Schematic SK24807 D 01
508
A508
PTO
ON/OFF
SWITCH
(SEE NOTE 5)
SPS IDLE TIMER
YEL
BLK
RED
TO A239
SPARE CIRCUIT
(SEE NOTE 6)
IGN
BAT
12
IGNITION
SWITCH
CAT ECM
CONNECTOR
(40-PIN)
1
418
2
569
3
552
576
4
577
5
455
6
417
7
8
A508
9
551
10
579
11
581
12
239
225
13
464
14
463
15
578
16
580
17
197
18
224
19
20
461
21
-
22
419
568
23
465
24
462
25
660
26
468
27
522 522
28
29
457
30
-
31
-
32
-
661
33
34
-
582
35
567
36
458
37
38
-
662
39
466
40
NOTES:
1) SCHEMATIC FOR CATERPILLAR 3406E/3176 ENGINES IN CONVENTIONAL MODELS.
2) ALL PRESSURE SWITCHES SHOWN NOT PRESSURIZED.
3) ALL RELAYS SHOWN NOT ENERGIZED.
4) CLUTCH SWITCH SHOWN WITH CLUTCH ENGAGED (POWER TO THE DRIVE WHEELS.)
5) CONNECT PTO TOGGLE SWITCH IN SERIES WITH THE PARKING BRAKE SWITCH ONLY
WHEN SEPARATE SWITCH ON DASH OPTION TO ENGAGE PTO IS REQUIRED.
6) BRAKESAVER AND IDLE TIMER SHUTDOWN OPTIONS CANNOT
BE USED TOGETHER.
J1587
ATA
DATA
LINK AND
CAP
23
418
417
661
662
ABC
BAT
BAS
J1939
DATA
LINK AND
CAP
AUTOSHIFT
J1939
(OPTION)
CAT COLD
DASH SHUTDOWN
SWITCH
MARK IDLE TIMER
660
568
ABC
COOLANT
LEVEL
SENSOR
569
567
457
D
CBA
D
XA12 23
X
ENGINE HARNESS
5
6
7
6
7
0
GROUND TO
CYLINDER
HEAD STUD
PARKING BRAKE SW
(NC)
(OPENS AT 2-6 PSI)
4
4
6
5
5
7
A
BT
BS
A
CLUTCH SWITCH
(NO)
(SHOWN WITH
CLUTCH ENGAGED)
CONST PWR
MAIN CAB
HARN
239
197
BABAT
S
ROAD
SPEED
SENSOR
A508 457
(OPENS AT 2-6 PSI)
A464
(OPENS AT 2-6 PSI)
A464 464
BRAKESAVER
APPLICATION SWITCH
(OPENS AT 2-6 PSI)
19 19
FIREWALL
CONNECTOR
A
418 418
B
417
417
-
C
-
D
576
576
-
E
-
F
455
455
-
G
-
H
A508
A508
-
J
-
K
579
579
L
581
581
-
M
-
N
225
225
P
464
464
Q
463
463
R
578
578
S
580
580
T
457
457
U
224
224
V
461
461
W
419
419
X
552
552
Y
551
551
-
Z
-
a
462
462
b
466 466
c
468
468
d
522
-
e
-
f
582
582
g
458
458
THROTTLE
POSITION
SENSOR
CKT FUNCTION
CAT ELEC SYSTEM SHUTDOWN
12
CAT ELEC SYSTEM SHUTDOWN
A12
12V POWER (KEY ON)
23
VEHICLE SPEED IN (+)
197
ENGINE FAN
220
ENGINE BRAKE (FRONT)
224
ENGINE BRAKE (REAR)
225
SPARE 12V (KEY ON, FUSED)
226
(-) GROUND
239
DASH POWER (KEY ON, FUSED)
242
DASH ILLUMINATION
253
FUSED UNSWITCHED POWER
298
MAIN ACCESSORY POWER
304
CRUISE CONTROL "ON" LIGHT
354
417
418
CHECK ENGINE LIGHT
419
WARNING LIGHT
438
ENGINE POWER
453
PARKING BRAKE
SWITCH
(NC)
SERVICE BRAKE
SWITCH
(NC)
(NC)
DATA LINK (+)
DATA LINK (-)
457
SHUTDOWN RELAY
458
457
582
CBA
J11
ABC
P11
WHBKRD
SIGNAL
RETURN
POWER
(PWM)
FUSE/RELAY
HARNESS
19 19
239A466
CHASSIS GND
418
417
BAT
BAS
J1587
ATA
DATA
LINK AND
CAP
455
457
458
461
462
463
464
465
466
468
508
A508
522
551
552
A554
B554
KEY
23
CONST PWR
ROOF HARN
418
417
699
552
551
ABCDEF
BAT
BAS
DIAGNOSTIC
CONNECTOR
(AND CAP)
J1922
ATA
DATA
LINK AND
CAP
DIAGNOSTICS POWER454
ECM POWER
GROUND-SENSORS
THROTTLE SENSOR OUTPUT
CRUISE - ON
CRUISE - SET
CRUISE - RESUME
SERVICE BRAKE SWITCH
CLUTCH SWITCH
ENGINE BRAKE ENABLE
WARNING BEEPER
PTO ON/OFF SWITCH
PTO VALIDATION SIGNAL
ENGINE FAN DISABLE
J1922 DATA LINK (+)
J1922 DATA LINK (-)
BRAKESAVER POWER
BRAKESAVER POWER
23
A23
SHUTDOWN CONNECTION
BRAKESAVER FUSE
226
10 AMP
A466
A466
239
CKT FUNCTIONCKT FUNCTION
C554
554
557
567
568
569
576
577
578
579
580
581
582
660
661
662
699
700
ENGINE POWER RELAY
700
A23
BRAKESAVER/
SHUTDOWN RELAY
(SEE NOTE 6)
A12
C554
466
A466
ENGINE FAN RELAY
226
522
700
454
455
12
B
12
5
B
7
A
6
R
T
E
T
C
E
O
5
R
R
A
Y
D
M
E
E
P
V
R
E
N
T
2
9
8
CONNECT AT MAIN
CAB CIRCUIT
BREAKER
123456789
700
454
455
7
0
0
F
P
U
O
S
2
W
E
0
/
E
R
A
R
E
M
L
P
A
Y
2
9
8
457
457
A12
A
A12
BRAKESAVER POWER
BRAKESAVER POWER
BRAKESAVER ON/OFF
+5V LOW COOLANT SENSOR
COOLANT LEVEL LOW
COOLANT LEVEL NORMAL
BATTERY EVENT RECORDER
ECM GROUND STUD
SPEEDOMETER (+)
SPEEDOMETER (-)
TACHOMETER (+)
TACHOMETER (-)
+8V THROTTLE PEDAL
J1939 DATA LINK (SHIELD)
J1939 DATA LINK (+)
J1939 DATA LINK (-)
DIAGNOSTIC POWER
FUSE/RELAY POWER
ECM FUSE
455453
-
-
CAB
HARNESS
226
CONNECT TO SPARE
POWER CONNECTION #3
USE 20 AMP FUSE
15 AMP
DIAGNOSTICS FUSE
FAN FUSE
10 AMP
10 AMP
220A220
454453
220
226
239
ABC
220
226
239
242
239
C0NNECT TO SPEEDO
HARNESS SPARE
457
454
JAKE BRAKE
ON/OFF
SWITCH
CHASSIS GND
(SHUTDOWN
OPTION)
+
WARNING
BEEPER
354
461
CRUISE
ON/OFF
SWITCH
ABS
OFF
ON
CONNECTOR
554 A554
-
438
468
OFF
ON
242
457 457
438
419419
438
4
1
9
WARNING LIGHT BAR
CONNECTORS
(MAIN CAB HARNESS)
JAKE BRAKE
RANGE SWITCH
BRAKESAVER
AUTO/MAN
SWITCH
OFF
ON
557
239
CYLINDER HEAD
GROUND STUD
CRUISE SWITCH ILLUMINATION
A508A508A508
SERVICE ONLY
E.C.N. NO.
DATE
BY
LOW
MED
HIGH
B554554
460
460
BRAKESAVER
AUTO/MANUAL
SOLENOID
SET
NONE
RES
462
463
CRUISE
SWITCH
SET/RESUME
354
2
2
0
2
2
0
4
354354
220
3
8
9801586
12-21-98
J.M.WATSON REM
224
225
B554
239253
220
TO ENGINE
HARNESS
453
239
12
554
557
A220
239
A508
464
466
522
554
557
-
101112
A508
464
466
522
554
557
-
6
9
9
D
I
P
A
O
1
G
0
W
N
A
O
E
M
R
S
P
T
I
C
2
9
8
SK24807.FM
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