Wire Description
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
Power Circuits
Basic Machine Circuits (Continued)
101 RD BATTERY 313 GY
STARTER NO. 2 TO DIAGNOSTIC/RESISTOR
TO DIAGNOSTIC
102 BU HEAD LAMP 314 PU STARTER RELAY NO. 2 OUTPUT
103 YL DOME / DASH LAMP / PARK, TAIL LAMP 321 BR BACKUP ALARM / LAMP
105 BR KEY SWITCH 322 GY WARNING HORN (FORWARD)
106 WH MAIN POWER RELAY / INPUT 323 WH FUEL TRANSFER PUMP POWER
107 WH ENGINE SHUT DOWN 324 BU DIFFERENTIAL LOCKUP SOLENOID
108 BU MISC WIPER, DOME LAMP, CIGAR LIGHTER 325 PK FUEL PUMP RELAY OIL PRESS. SWITCH
109 OR ALTERNATOR 326 PU KEY SWITCH “C” TERMINAL
110 GN WINDSHIELD WIPER SWITCH (RIGHT) 327 PK SHUTDOWN SOLENOID
111 YL WINDSHIELD WIPER SWITCH (LEFT) 328 RD SHUTDOWN MODULE OFF”
112 PU MAIN POWER RELAY / OUTPUT Monitoring Circuits
113 OR OPERATOR MONITOR PANEL 400 GN SERVICEMETER SWITCH
114 GN WARNING HORN (FORWARD) 403 GN ALTERNATOR (R) TERMINAL
115 PK FLOOD LAMP (FRONT) 404 YL
OPERATOR MON PANEL HYDRAULIC OIL
TEMP
116 BR FLOOD LAMP (REAR) 405 GY OPERATOR MON PANEL OIL PRESSURE
117 YL FLOOD LAMP (SIDE) 406 PU
OPERATOR MON PANEL COOLANT
TEMPERATURE
118 GY WINDSHIELD WIPER SWITCH (FRONT) 407 PK
OPERATOR MON PANEL CONV /RETARDER
OIL TEMP
119 PK WINDSHIELD WIPER SWITCH (REAR) 408 WH
OPERATOR MON PANEL BRAKE PRESS.
(AIR)
120 YL CONVERTER (24 V to 12 V) 409 OR OPERATOR MON PANEL NEUTRAL
121 YL
BACKUP ALARM/LAMP/TRAVEL ALARM
TIMER
410 WH OPERATOR MON PANEL FAULT ALARM
122 BU AIR DRYER 411 PK
OPERATOR MON PANEL MASTER FAULT
LAMP
123 WH
GAGES (SERVICEMETER, TORQUE CONV
SOLENOID)
412 BU OPERATOR MON PANEL COOLANT FLOW
124 GN AIR CONDITIONER 413 BR OPERATOR MON PANEL FUEL PRESSURE
125 OR FUEL TRANSFER PUMP 414 PK OPERATOR MON PANEL LOW FUEL
126 PK TRANSMISSION CONTROL 415 GN OPERATOR MON PANEL TEST SWITCH
127 OR CAB FLOOD LAMP 416 OR SECONDARY STEERING SWITCH
128 PK KICKOUT SOLENOID SWITCH 417 GY PRIMARY STEERING SWITCH
129 BU CIGAR LIGHTER 418 YL
OPERATOR MON PANEL OIL PRESSURE
(HIGH SETTING)
130 GN STOP LAMP 419 YL OPERATOR MON PANEL PARKING BRAKE
131 BR FIRE CONTROL-OPERATOR WARNING 420 OR
OPERATOR MON PANEL FUEL
FILTER / LOW ACCUM PRESS.
132 PK ANTISPIN CONTROL 421 BU
OPERATOR MON PANEL FAULT LAMP
(SCRAPER)
133 OR
PROGRAMMED ELECTRONIC ENG CONT
SOLENOID
422 YL
OPERATOR MON WARNING HORN
(SCRAPER)
134 PK
PROGRAMMED ELECTRONIC ENG CONT
LOGIC
423 GY
OPERATOR MON PANEL TEST SWITCH
(SCRAPER)
136 GN SUPPLEMENTAL STEERING 424 GY
OPERATOR MON PANEL POWER TRAIN
TEMPERATURE
137 RD STEERING MOTOR INDICATOR 425 PK
OPERATOR MON PANEL POWER TRAIN OIL
LEVEL
138 GN AUTOMATIC LUBE PUMP (TRUCK) 426 BR
OPERATOR MON PANEL POWER TRAIN OIL
FILTER
141 PK AUXILIARY HEATER 427 GN
OPERATOR MON PANEL POWER TRAIN OIL
FILTER JUMPER
Ground Circuits 428 OR
OPERATOR MON PANEL TRANSMISSION OIL
TEMP
200 BK MAIN CHASSIS 429 YL
OPERATOR MON PANEL BRAKE OIL
TEMPERATURE
201 BK OPERATOR MONITOR PANEL 431 GN
OPERATOR MON PANEL LOW TRANSFER
PUMP PRESS.
202 BK TRANSMISSION CONTROL 432 PK
OPERATOR MON PANEL BRAKE
PRESSURE (OIL)
203 BK CHASSIS DIAGNOSTIC 433 BU
OPERATOR MON PANEL BRAKE PRESS.
(OIL) JUMPER
204 BK OPERATOR MONITOR PANEL (SCRAPER) 434 BU
OPERATOR MON PANEL POWER TRAIN
TEMP JUMPER
205 BK INSTRUMENT 435 YL
OPERATOR MON PANEL POWER TRAIN
TEMP JUMPER
206 BK BATTERY SIDE OF DISCONNECT 436 OR
OPERATOR MON PANEL POWER TRAIN OIL
FILTER JUMPER
207 BK STARTER DIAGNOSITC 437 BR
OPERATOR MON PANEL FUEL LEVEL TO
FUEL FILTER JUMPER
212 BK ANTISPIN CODING PIN 16 438 YL
OPERATOR MON PANEL COOLANT TEMP
JUMPER
213 BK ANTISPIN CODING PIN 17 440 BR AIR PRESS. GAGE
214 BK ANTISPIN CODING PIN 18 441 OR ENGINE COOLANT TEMP GAGE
215 BK ANTISPIN CODING PIN 19 442 GY HYDRAULIC SYSTEM TEMP GAGE
216 BK ANTISPIN CODING PIN 20 443 YL POWER TRAIN TEMP GAGE
217 BK TRANSMISSION CODING PIN 17 444 BU
CONV / RETARDER OIL TEMP GAGE
(TRACTOR)
218 BK TRANSMISSION CODING PIN 18 445 GN
CONV / RETARDER OIL TEMP GAGE
(SCRAPER)
219 BK TRANSMISSION CODING PIN 19 446 PU BRAKE OIL TEMPERATURE GAGE
226 BK OPERATOR MON PANEL SET POINT SELECT 449 BU SPEEDOMETER SENDER (SIGNAL)
227 BK TRANSMISSION CODING PIN 37 450 YL TACHOMETER SENDER (+)
231 BK TRANSMISSION SW 451 BR TACHOMETER SENDER (-)
236 BK TRANSMISSION CODING PIN 36 452 PU TORQUE CONVERTER
241 BK OPERATOR MON PANEL TIME DELAY PIN 3 453 PK SECONDARY STEERING FAULT LAMP
242 BK OPERATOR MON PANEL TIME DELAY PIN 4 454 GN RETARDER INDICATOR LAMP
243 BK OPERATOR MON PANEL TIME DELAY PIN 5 455 YL CONVERTER TEMP SWITCH TO TIME DELAY
244 BK OPERATOR MON PANEL TIME DELAY PIN 6
Basic Machine Circuits
301 BU STARTER NO. 1 SOLENOID TO RESISTOR
302 OR
STARTER NO. 1 TO DIAGNOSTIC / RESISTOR
TO DIAGNOSTIC
304 WH STARTER RELAY NO. 1 OUTPUT
306 GN
STARTER RELAY COIL / NEUTRAL START
SWITCH
308 YL MAIN POWER RELAY COIL
310 PU ETHER SWITCH TO ETHER SOLENOID
311 WH
ETHER SOLENOID TO TEMPERATURE
SWITCH
312 PK STARTER NO. 2 SOLENOID TO RESISTOR
Wire Description
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
Accessory Circuits Control Circuits
500 BR WINDSHIELD WIPER - FRONT (PARK) 702 OR TRANSMISSION BRAKE SWITCH JUMPER
501 GN WINDSHIELD WIPER - FRONT (LOW) 703 BU TRANSMISSION UP SOLENOID
502 OR WINDSHIELD WIPER - FRONT (HIGH) 704 GY TRANSMISSION DOWN SOLENOID
503 BR WINDSHIELD WIPER - REAR (PARK) 705 PK TRANSMISSION LOCKUP CLUTCH SOL BASIC
504 YL WINDSHIELD WIPER - REAR (LOW) 706 BR TRANSMISSION RETARDER SWITCH
505 BU WINDSHIELD WIPER - REAR (HIGH) 707 PU TRANSMISSION BED RAISE SWITCH
506 PU WINDSHIELD WASHER FRONT 708 YL TRANSMISSION HOLD SWITCH
507 WH WINDSHIELD WASHER REAR 709 OR TRANSMISSION PICKUP POWER
510 YL WINDSHIELD WASHER-PRIMER 710 GN TRANSMISSION SPEED PICKUP SIGNAL
513 OR AIR CONDITIONER COMPRESSOR 711 BR TRANSMISSION LEVER CODE 1
514 PU AIR CONDITIONER CONDENSOR MOTOR 712 WH TRANSMISSION LEVER CODE 2
515 GY BLOWER MOTOR (HIGH) 713 OR TRANSMISSION LEVER CODE 3
516 GN BLOWER MOTOR (MEDIUM) 714 YL TRANSMISSION LEVER CODE 4
517 BU BLOWER MOTOR (LOW) 715 GN TRANSMISSION LEVER CODE 5
519 PK THERMOSTAT TO DRYER PRESSURE SWITCH 716 BU TRANSMISSION LEVER CODE 6
520 WH
OPERA TOR AIR CONDITIONER SWITCH TO
THERMOSTAT
720 PU TRANSMISSION BRAKE SWITCH
521 YL AIR COND SW TO RFGT SW 721 BR TRANSMISSION GEAR CODE 1
522 WH AIR COND COMPR TO THERMO SW 722 WH TRANSMISSION GEAR CODE 2
523 BR WINDSHIELD WIPER-LEFT (PARK) 723 OR TRANSMISSION GEAR CODE 3
524 BU WINDSHIELD WIPER-LEFT (LOW) 724 YL TRANSMISSION GEAR CODE 4
525 GY WINDSHIELD WIPER-LEFT (HIGH) 725 GN TRANSMISSION GEAR CODE 5
526 YL WINDSHIELD WIPER-RIGHT (PARK) 726 BU TRANSMISSION GEAR CODE 6
527 GN WINDSHIELD WIPER-RIGHT (LOW) 727 GN STEERING MOTOR RELAY
528 PK WINDSHIELD WIPER-RIGHT (HIGH) 728 BU
SUPPLEMENTAL STEERING CONTROL
SWITCH
529 WH WINDSHIELD W ASHER-LEFT 733 BR SWITCHING GEAR CODE 1 FRONT
530 OR WINDSHIELD W ASHER-RIGHT 734 WH SWITCHING GEAR CODE 2 FRONT
531 WH FIRE WARNING HORN 735 OR SWITCHING GEAR CODE 3 FRONT
532 WH FIRE WARNING LAMP 736 YL SWITCHING GEAR CODE 4 FRONT
533 RD HEAT SENSOR/TEST SWITCH 737 GN SWITCHING GEAR CODE 5 FRONT
534 WH HEAT SENSOR/TEST SWITCH 738 BR SWITCHING GEAR CODE 1 REAR
535 BU TRAVEL ALARM TIMER PRESS SWITCH 739 WH SWITCHING GEAR CODE 2 REAR
536 OR TRAVEL ALARM TIMER MANUAL OVERRIDE 740 OR SWITCHING GEAR CODE 3 REAR
537 GR TURN SIGNAL SWITCH TO FLASHER 741 YL SWITCHING GEAR CODE 4 REAR
538 BR HAZARD INDICA TOR 742 GN SWITCHING GEAR CODE 5 REAR
539 BU TURN SIGNAL INDICATOR BASIC/RIGHT 743 PU SWITCHING NEUTRAL / RUN SWITCH
540 WH TURN SIGNAL INDICA TOR LEFT 744 BU SWITCHING UP SOLENOID
Lighting Circuits 745 GY SWITCHING DOWN SOLENOID
600 BR DASH BASIC 746 PK SWITCHING SYNCHRONIZE SOLENOID
601 GY DASH HIGH 747 WH SWITCHING NO SYNCHRONIZE SOLENOID
602 WH DOME 756 WH TRANSMISSION LOCKUP CLUTCH SOLENOID
603 PK ROTARY BEACON 761 GY LIFT KICKOUT SOLENOID SWITCH
604 OR STOP 762 YL BUCKET POSITIONER SOLENOID SWITCH
605 YL TURN LEFT 763 BU TORQUE CONVERTER SOLENOID
606 GY TURN RIGHT 764 PU
SUPPLEMENTAL STEERING CONTROL
SWITCH (MOTOR GRADER)
607 PK FLOOD FRONT 765 OR APRON SOLENOID (SCRAPER)
608 GN FLOOD REAR 767 WH ANTISPIN PICKUP POWER
609 YL FLOOD SIDE 768 OR ANTISPIN PICKUP TRANSMISSION
610 OR HEAD LAMP BASIC 769 BU ANTISPIN PICKUP LEFT
611 PU HEAD LAMP HIGH 770 GN ANTISPIN PICKUP RIGHT
612 GY BACKUP 771 PU ANTISPIN SERVICE BRAKE SWITCH
613 PK LICENSE PLA TE 772 BR ANTISPIN RETARDER SWITCH
614 PU PARK/TAIL/DASH 773 GY ANTISPIN SERVOVALVE
615 YL CAB FLOOD / ROPS 774 YL ANTISPIN SOLENOID - LEFT
616 BU BUCKET FLOOD 775 BR ANTISPIN SOLENOID - RIGHT
617 BR
TAIL / POSITION LAMP-LEFT
(ROADING PACKAGE)
618 YL
TAIL / POSITION LAMP-RIGHT
(ROADING PACKAGE)
619 GR HEAD LAMP LOW
622 PU FLOODLAMP 3 WAY SWITCH JUMPER
623 BU FLOOD LAMP 3 WAY SWITCH JUMPER
624 YL FLOOD LAMP BOWL
625 BK COURTESY LAMP
SENR3057
February 1984
Power Train
Electrical System
651E Wheel Tractor-Scraper Equipped With
Electronic Powershift Transmission Control System For
ICM (Individual Clutch Modulation) Type Transmission
88Z1-UP
89Z1-UP
©
1984 Caterpillar
All Rights Reserved
Printed in U.S.A.
12V BATTERY
733-BR
734-WH
735-OR
736-YL
737-GN
126-PK
202-BK
D
3
4
5
6
7
2
1
7
12V BATTERY
12V BATTERY
POS
NEG
NEGPOS
DISCONNECT SW.
S
G
BAT
MTR
MOTOR
STARTER
TO
FRAME
TO ENG
BLOCK
711-BR
712-WH
713-OR
714-YL
715-GN
716-BU
202-BK
EMS PIN 9
200-BK
BACKUP ALARM
202-BK
1
2
3
4
5
6
7
8
9
10
D
Z
14
711-BR-18
712-WH-18
713-OR-18
714-YL-18
715-GN-18
716-BU-18
202-BK-18
409-OR-18
200-BK
3
4
5
6
7
8
9
1
2
10
LEVER 1
LEVER 2
LEVER 3
LEVER 4
LEVER 5
GND VERIFY
GROUND
NEUTRAL
SHIFT LEVER
SWITCH
Z
N.O.
N.C.
708-YL
202-BK
10
D
NN
37
D
8
6
9
HOLD SW.
721-BR 21
22
23
24
25
26
NN
722-WH
723-OR
724-YL
725-GN
726-BU
708-YL
202-BK
721-BR
722-WH
723-OR
724-YL
725-GN
726-BU
D
J
709-OR
710-GN
202-BK
703-BU
704-GY
9
10
2
3
4
A
G
B
C
E
F
H
A
C
B
J
J
J
J
Y
A
B
A
B
10
+V
SIGNAL
GROUND
709-OR
710-GN
202-BK
703-BU
704-GY
TRANSMISSION
SPEED
SENDER
UP SHIFT
SOLENOID
9P222
DOWN SHIFT
SOLENOID
9P222
231-BK-18
721-BR-18
722-WH-18
723-OR-18
724-YL-18
725-GN-18
726-BU-18
GEAR 1
S
GEAR 2
GEAR 3
GEAR 4
GEAR 5
GND VERIFY
GROUND
10
9
8
7
6
5
4
3
2
1
TRANSMISSION SW.
(TRACTOR)
Y
9
10
5
2
3
6
4
20
7
21
22
23
24
25
26
27
+V
XMSN SP
GROUND
UP SHIFT SOL
DOWN SHIFT SOL
GEAR 1
GEAR 2
GEAR 3
GEAR 4
GEAR 5
GND VERIFY
D
28
8
29
30
36
11
12
13
14
15
16
19
18
17
37
HOLD SW.
LEVER 1
LEVER 2
LEVER 3
LEVER 4
LEVER 5
GND VERIFY
ID CODE 0
ID CODE 1
ID CODE 3
ID CODE 2
FRONT GEAR 1
FRONT GEAR 2
FRONT GAER 3
FRONT GEAR 4
FRONT GEAR 5
BATTERY
31
32
33
34
35
1
(TRACTOR)
TRANSMISSION
CONTROL
10A
FUSE
BACKUP
ALARM SW.
R
N
1
2
3
4
5
10
9
8
6
5
4
3
2 1
6
7
8
TEST
N
N
R
1
2
3
4
1
2
5
6
10
9
8
7
6
4
3
2
1
TRANSMISSION
SWITCH
SHIFT LEVER
SWITCH
D 65601
3
4
5
1
2
10 PIN CONNECTOR
(J) 5T8318 HARNESS (CHASSIS)
(Y) 7T3418 HARNESS
10 PIN CONNECTOR
(Y) 7T3418 HARNESS
TRACTOR TRANSMISSION
SWITCH
14 PIN CONNECTOR
(D) 6G9731 HARNESS (CAB)
(Z) 3T2337 HARNESS
10 PIN CONNECTOR
(Z) 3T2337 HARNESS
SHIFT LEVER SWITCH
37 PIN CONNECTOR
(D) 6G9731 HARNESS (CAB)
(J) 5T8318 HARNESS (CHASSIS)
37 PIN CONNECTOR
(D) 6G9731 HARNESS (CAB)
(TRACTOR) TRANSMISSION
CONTROL
10 PIN CONNECTOR
(D) 6G9731 HARNESS (CAB)
(NN) 5T1764 HARNESS
8 PIN CONNECTOR
(D) 8G9731 HARNESS (CAB)
(NN) 5T1764 HARNESS
CATE
RPILL
AR
6
51E
3
4
5
1
2
37 PIN CONNECTOR
(D) 6G9731 HARNESS (CAB)
(TRACTOR) TRANSMISSION
CONTROL
14 PIN CONNECTOR
(D) 6G9731 HARNESS (CAB)
(Z) 3T2733 HARNESS
10 PIN CONNECTOR
(Z) 3T2733 HARNESS
SHIFT LEVER SWITCH
9 PIN CONNECTOR
(D) 6G9731 HARNESS (CAB)
(NN) 5T1764 HARNESS
10 PIN CONNECTOR
(D) 6G9731 HARNESS (CAB)
(NN) 5T1764 HARNESS
37 PIN CONNECTOR
(D) 6G9731 HARNESS (CAB)
(J) 5T8318 HARNESS (CHASSIS)
10 PIN CONNECTOR
(J) 5T8318 HARNESS (CHASSIS)
(Y) 7T3418 HARNESS
10 PIN CONNECTOR
(Y) 7T3418 HARNESS
TRACTOR TRANSMISSION
SWITCH
B51591X5
651E TRACTOR-SCRAPER
1. Tractor Transmission
Control.
2. Shift Lever Switch.
3. Tractor Transmission
Switch.
4. Transmission Speed Sender
5. Upshift & Downshift
Solenoids.
9G2795
6G4195
3K8782
902648
902648
7N719
3T2780
9G8204
7T3419
9G8204
IDENT.
HARNESS AS.
6G9731
D
J
Y
X
NN
5T8318
7T3418
3T2337
5T1764
6T2156
7T3419
6T6590
