SENR2636

16Page,NJJ

©1982 Caterpillar

All Rights Reserved

Printed in U.S.A.

SENR2636

July 1982

988B Wheel Loader

Electrical System

50W6041-UP50W6013

Wire Description

Circuit

NumberWire Color Power Distribution Circuits

Wire

NumberWire Color MONITORING CIRCUITS (CONTINUED)

101 RD BATTERY 436 OROPERATOR MON PANEL POWER TRAIN

OILFILTER JUMPER

102 BU HEAD LAMP 437 BROPERATOR MON PANEL FUEL LEVEL

TO FUEL FILTER JUMPER

103 YL DOME/DASHLAMP/PARK, TAIL LAMP 438 YLOPERATOR MON PANEL COOLANT

TEMP JUMPER

105 BR KEY SWITCH 440 BR AIR PRESS. GAGE

106 WH MAIN POWER RELAY/INPUT 441 OR ENGINE COOLANT TEMP GAGE

107 WH ENGINE SHUT DOWN 442 GY HYDRAULIC SYSTEM TEMP GAGE

108 BU MISC WIPER, DOME LAMP, CIGAR LIGHTER 443 YL POWER TRAIN TEMP GAGE

109 OR ALTERNATOR 446 PU BRAKE OIL TEMPERATURE GAGE

110 GN WINDSHIELD WIPER SWITCH (RIGHT) 449 BU SPEEDOMETER SENDER (SIGNAL)

111 YL WINDSHIELD WIPER SWITCH (LEFT) 450 YL TACHOMETER SENDER (+)

112 PU MAIN POWER RELAY/OUTPUT 451 BR TACHOMETER SENDER (-)

113 OR OPERATOR MONITOR PANEL 452 PU TORQUE CONVERTER

114 GN WARNING HORN (FORWARD) 453 PK SECONDARY STEERING FAULT LAMP

115 PK FLOOD LAMP (FRONT) 454 GN RETARDER INDICATOR LAMP

116 BR FLOOD LAMP (REAR) ACCESSORY CIRCUITS

117 YL FLOOD LAMP (SIDE) 500 BR WINDSHIELD WIPER- FRONT (PARK)

118 GY WINDSHIELD WIPER SWITCH (FRONT) 501 GN WINDSHIELD WIPER- FRONT (LOW)

119 PK WINDSHIELD WIPER SWITCH (REAR) 502 OR WINDSHIELD WIPER- FRONT (HIGH)

120 YL CONVERTER (24V TO 12V) 503 BR WINDSHIELD WIPER- REAR (PARK)

121 YLBACKUP ALARM/LAMP/TRAVEL ALARM

TIMER504 YL WINDSHIELD WIPER- REAR (LOW)

122 BU AIR DRYER 505 BU WINDSHIELD WIPER- REAR (HIGH)

123 WHGAGES (SERVICEMETER, TORQUE CONV

SOLENOID)506 PU WINDSHIELD WASHER FRONT

124 GN AIR CONDITIONER 507 WH WINDSHIELD WASHER REAR

127 OR CAB FLOOD LAMP 510 YL WINDSHIELD WASHER- PRIMER

128 PK KICKOUT SOLENOID SWITCH 513 OR AIR CONDITIONER COMPRESSOR

129 BU CIGAR LIGHTER 514 PU AIR CONDITIONER CONDENSER MOTOR

130 GN STOP LAMP 515 GY BLOWER MOTOR (HIGH)

131 BR FIRE CONTROL- OPERATOR WARNING 516 GN BLOWER MOTOR (MEDIUM)

136 GN SUPPLEMENTAL STEERING 517 BU BLOWER MOTOR (LOW)

137 RD STEERING MOTOR INDICATOR 519 PKTHERMOSTAT TO DRYER PRESSURE

SWITCH

141 PK AUXILIARY HEATER 520 WHOPERATOR AIR CONDITIONER SWITCH

TO THERMOSTAT

GROUND CIRCUITS 523 BR WINDSHIELD WIPER- LEFT (PARK)

200 BK MAIN CHASSIS 524 BU WINDSHIELD WIPER- LEFT (LOW)

201 BK OPERATOR MONITOR PANEL 525 GY WINDSHIELD WIPER- LEFT (HIGH)

203 BK CHASSIS DIAGNOSTIC 526 YL WINDSHIELD WIPER- RIGHT (PARK)

205 BK INSTRUMENT 527 GN WINDSHIIELD WIPER- RIGHT (LOW)

206 BK BATTERY SIDE OF DISCONNECT 528 PK WINDSHIELD WIPER- RIGHT (HIGH)

207 BK STARTER DIAGNOSTIC 529 WH WINDSHIELD WASHER- LEFT

MACHINE BASIC CIRCUITS 530 OR WINDSHIELD WASHER- RIGHT

301 BU STARTER NO. 1 SOLENOID TO RESISTOR 531 WH FIRE WARNING HORN

302 ORSTARTER NO. 1 TO DIAGNOSTIC/RESISTOR

TO DIAGNOSTIC532 WH FIRE WARNING LAMP

304 WH STARTER RELAY NO. 1 OUTPUT 533 RD HEAT SENSOR/TEST SWITCH

306 GNSTARTER RELAY COIL/NEUTRAL START

SWITCH534 WH HEAT SENSOR/TEST SWITCH

308 YL MAIN POWER RELAY COIL 535 BU TRAVEL ALARM TIMER PRESS SWITCH

310 PU ETHER SWITCH TO ETHER SOLENOID 536 ORTRAVEL ALARM TIMER MANUAL

OVERRIDE

311 WHETHER SOLENOID TO TEMPERATURE

SWITCH537 GR TURN SIGNAL SWITCH TO FLASHER

312 PK STARTER NO. 2 SOLENOID TO RESISTOR 538 BR HAZARD INDICATOR

313 GYSTARTER NO. 2 TO DIAGNOSTIC/RESISTOR

TO DIAGNOSTIC539 BU TURN SIGNAL INDICATOR BASIC/RIGHT

314 PU STARTER RELAY NO. 2 OUTPUT 540 WH TURN SIGNAL INDICATOR LEFT

321 BR BACKUP ALARM/LAMP LIGHTING CIRCUITS

322 GY WARNING HORN (FORWARD) 600 BR DASH BASIC

326 PU KEY SWITCH "C" TERMINAL 601 GY DASH HIGH

327 PK SHUTDOWN SOLENOID 602 WH DOME

328 RD SHUTDOWN MODULE "OFF" 603 PK ROTARY BEACON

MONITORING CIRCUITS 604 OR STOP

400 GN SERVICEMETER SWITCH 605 YL TURN LEFT

403 GN ALTERNATOR TERMINAL 606 GY TURN RIGHT

404 YLOPERATOR MON PANEL HYDRAULIC OI

TEMP607 PK FLOOD FRONT

405 GY OPERATOR MON PANEL OIL PRESSURE 608 GN FLOOD REAR

406 PUOPERATOR MON PANEL COOLANT

TEMPERATURE609 YL FLOOD SIDE

407 PKOPERATOR MON PANEL CONV/RETARDER

OIL TEMP610 OR HEAD LAMP BASIC

408 WH OPERATOR MON PANEL BRAKE PRESS. (AIR) 611 PU HEAD LAMP HIGH

409 OR OPERATOR MON PANEL NEUTRAL 612 GY BACKUP

410 WH OPERATOR MON PANEL FAULT ALARM 613 PK LICENSE PLATE

411 PKOPERATOR MON PANEL MASTER FAULT

LAMP614 PU PARK/TAIL/DASH

412 BU OPERATOR MON PANEL COOLANT FLOW 615 YL CAB FLOOD/ROPS

413 BR OPERATOR MON PANEL FUEL PRESSURE 616 BU BUCKET FLOOD

414 PK OPERATOR MON PANEL LOW FUEL 617 BRTAIL/POSITION LAMP- LEFT (ROADING

PACKAGE)

415 GN OPERATOR MON PANEL TEST SWITCH 618 YLTAIL/POSITION LAMP- RIGHT (ROADING

PACKAGE)

416 OR SECONDARY STEERING SWITCH 619 GR HEAD LAMP LOW

417 GY PRIMARY STEERING SWITCH 622 PU FLOODLAMP 3 WAY SWITCH JUMPER

419 YL OPERATOR MON PANEL PARKING BRAKE 623 BU FLOODLAMP 3 WAY SWITCH JUMPER

424 GYOPERATOR MON PANEL POWER TRAIN

TEMPERATURE624 YL FLOODLAMP BOWL

425 PKOPERATOR MON PANEL POWER TRAIN OIL

LEVEL625 BK COURTESY LAMP

426 BROPERATOR MON PANEL POWER TRAIN OIL

FILTERCONTROL CIRCUITS

427 GNOPERATOR MON PANEL POWER TRAIN OIL

FILTER JUMPER727 GN STEERING MOTOR RELAY

428 OROPERATOR MON PANEL TRANSMISSION OIL

TEMPERATURE728 BU

SUPPLEMENTAL STEERING CONTROL

SWITCH

429 YLOPERATOR MON PANEL BRAKE OIL

TEMPERATURE761 GY LIFT KICKOUT SOLENOID SWITCH

431 GNOPERATOR MON PANEL LOW TRANSFER

PUMP PRESSURE762 YL BUCKET POSITIONER SOLENOID SWITCH

432 PKOPERATOR MON PANEL BRAKE PRESSURE

(OIL)763 BU TORQUE CONVERTER SOLENOID

433 BU OPERATOR MON PANEL BRAKE PRESS. (OIL) 764 PUSUPPLEMENTAL STEERING CONTROL

SWITCH (MOTOR GRADER)

434 BUOPERATOR MON PANEL POWER TRAIN TEMP

JUMPER

435 YLOPERATOR MON PANEL POWER TRAIN TEMP

JUMPER

SENR2636

16Page,NJJ