Circuit Number
Color
101
RD
Power Distribution Circuits BATTERY
102
BU
HEAD LAMP
103 105 106 107 108 109
YL BR WH WH BU OR
DOME/DASH LAMP / PARK, TAIL LAMP KEY SWITCH MAIN POWER RELAY / INPUT ENGINE SHUT DOWN MISC WIPER, DOME LAMP, CIGAR LIGHTER ALTERNATOR
110
GN
WINDSHIELD WIPER SWITCH (RIGHT)
111 112 113 114 115 116 117 118 119 120 121 122 123 124 125
YL PU OR GN PK BR YL GY PK YL YL BU WH GN OR
WINDSHIELD WIPER SWITCH (LEFT) MAIN POWER RELAY / OUTPUT OPERATOR MONITOR PANEL WARNING HORN (FORWARD) FLOOD LAMP (FRONT) FLOOD LAMP (REAR) FLOOD LAMP (SIDE) WINDSHIELD WIPER SWITCH (FRONT) WINDSHIELD WIPER SWITCH (REAR) CONVERTER (24 V to 12 V) BACKUP ALARM/LAMP/TRAVEL ALARM TIMER AIR DRYER GAGES (SERVICE METER, TORQUE CONV SOL) AIR CONDITIONER FUEL TRANSFER PUMP
126
PK
TRANSMISSION CONTROL
127 128 129 130 131 132 133 134 136 137
OR PK BU GN BR PK OR PK GN RD
CAB FLOOD LAMP KICKOUT SOLENOID SWITCH CIGAR LIGHTER STOP LAMP FIRE CONTROL-OPERATOR WARNING ANTISPIN CONTROL PROGRAMMED ELECTRONIC ENG CONT SOL PROGRAMMED ELECTRONIC ENG CONT LOGIC SUPPLEMENTAL STEERING STEERING MOTOR INDICATOR
138
GN
AUTOMATIC LUBE PUMP (TRUCK)
141
PK
AUXILIARY HEATER
Description
Ground Circuits 200 201 202 203 204 205
BK BK BK BK BK BK
MAIN CHASSIS OPERATOR MONITOR PANEL TRANSMISSION CONTROL CHASSIS DIAGNOSTIC OPERATOR MONITOR PANEL (SCRAPER) INSTRUMENT
206
BK
BATTERY SIDE OF DISCONNECT
207 212
BK BK
STARTER DIAGNOSTIC ANTISPIN CODING PIN 16
213
BK
ANTISPIN CODING PIN 17
214
BK
ANTISPIN CODING PIN 18
215
BK
ANTISPIN CODING PIN 19
216
BK
ANTISPIN CODING PIN 20
217
BK
TRANSMISSION COOING PIN 17
218
BK
TRANSMISSION CODING PIN 18
219
BK
TRANSMISSION CODING PIN 19
226 227 231 236 241 242 243
BK BK BK BK BK BK BK
OPERATOR MON PANEL SET POINT SELECT TRANSMISSION CODING PIN 37 TRANSMISSION SW TRANSMISSION CODING PIN 36 OPERATOR MON PANEL TIME DELAY PIN 3 OPERATOR MON PANEL TIME DELAY PIN 4 OPERATOR MON PANEL TIME DELAY PIN 5
244
BK
OPERATOR MON PANEL TIME DELAY PIN 6
Circuit Number
Color
301 302
BU OR
304 306 308 310 311 312 313
WH GN YL PU WH PK GY
314 321 322 323 324 325 326 327 328
PU BR GY WH BU PK PU PK RD
400 403 404 405 406 407
GN GN YL GY PU PK
408 409 410 411 412 413 414 415 416 417 418
WH OR WH PK BU BR PK GN OR GY YL
419 420
YL OR
421 422 423 424 425 426 427
BU YL GY GY PK BR GN
428 429 431
OR YL GN
432 433
PK BU
434
BU
435
YL
436
OR
437
BR
438 440 441 442 443 444 445 446 449
YL BR OR GY YL BU GN PU BU
Description Machine Basic Circuits STARTER NO. 1 SOLENOID TO RESISTOR STARTER NO. 1 TO DIAGNOSTIC / RESISTOR TO DIAGNOSTICS STARTER RELAY NO. 1 OUTPUT STARTER RELAY COIL / NEUTRAL START SWITCH MAIN POWER RELAY COIL ETHER SWITCH TO ETHER SOLENOID ETHER SOLENOID TO TEMPERATURE SWITCH STARTER NO. 2 SOLENOID TO RESISTOR STARTER NO. 2 TO DIAGNOSTIC / RESISTOR TO DIAGNOSTIC STARTER RELAY NO. 2 OUTPUT BACKUP ALARM/LAMP WARNING HORN (FORWARD) FUEL TRANSFER PUMP POWER DIFFERENTIAL LOCKUP SOLENOID FUEL PUMP RELAY OIL PRESS. SWITCH KEY SWITCH "C" TERMINAL SHUTDOWN SOLENOID SHUTDOWN MODULE “OFF” Monitoring Circuits SERVICE METER SWITCH ALTERNATOR (R) TERMINAL OPERATOR MON PANEL HYDRAULIC OIL TEMP OPERATOR MON PANEL OIL PRESSURE OPERATOR MON PANEL COOLANT TEMP OPERATOR MON PANEL CONV / RETARDER OIL TEMP OPERATOR MON PANEL BRAKE PRESS. (AIR) OPERATOR MON PANEL NEUTRAL OPERATOR MON PANEL FAULT ALARM OPERATOR MON PANEL MASTER FAULT LAMP OPERATOR MON PANEL COOLANT FLOW OPERATOR MON PANEL FUEL PRESSURE OPERATOR MON PANEL LOW FUEL OPERATOR MON PANEL TEST SWITCH SECONDARY STEERING SWITCH PRIMARY STEERING SWITCH OPERATOR MON PANEL OIL PRESSURE (HIGH SETTING) OPERATOR MON PANEL PARKING BRAKE OPERATOR MON PANEL FUEL FILTER / LOW ACCUM PRESS. OPERATOR MON PANEL FAULT LAMP (SCRAPER) OPERATOR MON WARNING HORN (SCRAPER) OPERATOR MON PANEL TEST SWITCH (SCRAPER) OPERATOR MON PANEL POWER TRAIN TEMP OPERATOR MON PANEL POWER TRAIN OIL LEVEL OPERATOR MON PANEL POWER TRAIN OIL FILTER OPERATOR MON PANEL POWER TRAIN OIL FILTER JUMPER OPERATOR MON PANEL TRANSMISSION OIL TEMP OPERATOR MON PANEL BRAKE OIL TEMP OPERATOR MON PANEL LOW TRANSFER PUMP PRESS. OPERATOR MON PANEL BRAKE PRESSURE (OIL) OPERATOR MON PANEL BRAKE PRESS. (OIL) JUMPER OPERATOR MON PANEL POWER TRAIN TEMP JUMPER OPERATOR MON PANEL POWER TRAIN TEMP JUMPER OPERATOR MON PANEL POWER TRAIN OIL FILTER JUMPER OPERATOR MON PANEL FUEL LEVEL TO FUEL FILTER JUMPER OPERATOR MON PANEL COOLANT TEMP JUMPER AIR PRESS. GAGE ENGINE COOLANT TEMP GAGE HYDRAULIC SYSTEM TEMP GAGE POWER TRAIN TEMP GAGE CONV/RETARDER OIL TEMP GAGE (TRACTOR) CONV /RETARDER OIL TEMP GAGE (SCRAPER) BRAKE OIL TEMPERATURE GAGE SPEEDOMETER SENDER (SIGNAL)
Circuit Color Number 450 451 452 453 454 455
YL BR PU PK GN YL
500 501 502 503 504 505 506 507 510 513 514 515 516 517 519 520
BR GN OR BR YL BU PU WH YL OR PU GY GN BU PK WH
521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540
YL WH BR BU GY YL GN PK WH OR WH WH RD WH BU OR GR BR BU WH
Description Monitoring Circuits (Cont.) TACHOMETER SENDER (+) TACHOMETER SENDER (-) TORQUE CONVERTER SECONDARY STEERING FAULT LAMP RETARDER INDICATOR LAMP CONVERTER TEMP SWITCH TO TIME DELAY Accessory Circuits WINDSHIELD WIPER - FRONT (PARK) WINDSHIELD WIPER - FRONT (LOW) WINDSHIELD WIPER - FRONT (HIGH) WINDSHIELD WIPER - REAR (PARK) WINDSHIELD WIPER - REAR (LOW) WINDSHIELD WIPER - REAR (HIGH) WINDSHIELD WASHER FRONT WINDSHIELD WASHER REAR WINDSHIELD WASHER-PRIMER AIR CONDITIONER COMPRESSOR AIR CONDITIONER CONDENSER MOTOR BLOWER MOTOR (HIGH) BLOWER MOTOR (MEDIUM) BLOWER MOTOR (LOW) THERMOSTAT TO DRYER PRESSURE SWITCH OPERATOR AIR CONDITIONER SWITCH TO THERMOSTAT AIR COND SW TO RFGT SW AIR COND COMPR TO THERMO SW WINDSHIELD WIPER-LEFT (PARK) WINDSHIELD WIPER-LEFT (LOW) WINDSHIELD WIPER-LEFT (HIGH) WINDSHIELD WIPER-RIGHT (PARK) WINDSHIELD WIPER-RIGHT (LOW) WINDSHIELD WIPER-RIGHT (HIGH) WINDSHIELD WASHER-LEFT WINDSHIELD WASHER-RIGHT FIRE WARNING HORN FIRE WARNING LAMP HEAT SENSOR/TEST SWITCH HEAT SENSOR/TEST SWITCH TRAVEL ALARM TIMER PRESS SWITCH TRAVEL ALARM TIMER MANUAL OVERRIDE TURN SIGNAL SWITCH TO FLASHER HAZARD INDICATOR TURN SIGNAL INDICATOR BASIC/RIGHT TURN SIGNAL INDICATOR LEFT Lighting Circuits
600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 622 623 624 625
BK BK BK BK BK BU WH GN OR YL PU WH BR GY PU BU GN OR BU GN WH WH GN GY
DASH BASIC DASH HIGH DOME ROTARY BEACON STOP TURN LEFT TURN RIGHT FLOOD FRONT FLOOD REAR FLOOD SIDE HEAD LAMP BASIC HEAD LAMP HIGH BACKUP LICENSE PLATE PARK/TAIL/DASH CAB FLOOD/ROPS BUCKET FLOOD TAIL/POSITION LAMP-LEFT (ROADING PACKAGE) TAIL/POSITION LAMP-RIGHT (ROADING PACKAGE) HEAD LAMP LOW FLOODLAMP 3 WAY SWITCH JUMPER FLOODLAMP 3 WAY SWITCH JUMPER FLOODLAMP BOWL COURTESY LAMP
Circuit Color Number 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 720 721 722 723 724 725 726
OR BU GY PK BR PU YL OR GN BR WH OR YL GN BU PU BR WH OR YL GN BU
Control Circuits TRANSMISSION BRAKE SWITCH JUMPER TRANSMISSION UP SOLENOID TRANSMISSION DOWN SOLENOID TRANSMISSION LOCKUP CLUTCH SOL BASIC TRANSMISSION RETARDER SWITCH TRANSMISSION BED RAISE SWITCH TRANSMISSION HOLD SWITCH TRANSMISSION PICKUP POWER TRANSMISSION SPEED PICKUP SIGNAL TRANSMISSION LEVER CODE 1 TRANSMISSION LEVER CODE 2 TRANSMISSION LEVER CODE 3 TRANSMISSION LEVER CODE 4 TRANSMISSION LEVER CODE 5 TRANSMISSION LEVER CODE 6 TRANSMISSION BRAKE SWITCH TRANSMISSION GEAR CODE 1 TRANSMISSION GEAR CODE 2 TRANSMISSION GEAR CODE 3 TRANSMISSION GEAR CODE 4 TRANSMISSION GEAR CODE 5 TRANSMISSION GEAR CODE 6
727
GN
STEERING MOTOR RELAY
728 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 756 761 762 763 764
BU BR WH OR YL GN BR WH OR YL GN PU BU GY PK WH WH GY YL BU PU
765 767 768 769 770 771 772 773 774 775
OR WH OR BU GN PU BR GY YL BR
SUPPLEMENTAL STEERING CONTROL SWITCH SWITCHING GEAR CODE 1 FRONT SWITCHING GEAR CODE 2 FRONT SWITCHING GEAR CODE 3 FRONT SWITCHING GEAR CODE 4 FRONT SWITCHING GEAR CODE 5 FRONT SWITCHING GEAR CODE 1 REAR SWITCHING GEAR CODE 2 REAR SWITCHING GEAR CODE 3 REAR SWITCHING GEAR CODE 4 REAR SWITCHING GEAR CODE 5 REAR SWITCHING NEUTRAL/RUN SWITCH SWITCHING UP SOLENOID SWITCHING DOWN SOLENOID SWITCHING SYNCHRONIZE SOLENOID SWITCHING NO SYNCHRONIZE SOLENOID TRANSMISSION LOCKUP CLUTCH SOLENOID LIFT KICKOUT SOLENOID SWITCH BUCKET POSITIONER SOLENOID SWITCH TORQUE CONVERTER SOLENOID SUPPLEMENTAL STEERING CONTROL SWITCH (MOTOR GRADER) APRON SOLENOID (SCRAPER) ANTISPIN PICKUP POWER ANTISPIN PICKUP TRANSMISSION ANTISPIN PICKUP LEFT ANTISPIN PICKUP RIGHT ANTISPIN SERVICE BRAKE SWITCH ANTISPIN RETARDER SWITCH ANTISPIN SERVOVALVE ANTISPIN SOLENOID - LEFT ANTISPIN SOLENOID - RIGHT
B70453X1
© 1985 Caterpillar All Rights Reserved
SENR3144 October 1985
Description
Printed in U.S.A.
776B Tractor & 777B Truck Power Train Electrical System TRACTOR #: 6JC1-UP
TRUCK #: 4YC1-UP