GMC Rally G3500 (1985-1996) brake fuse 18 Wiring diagrams

ABS IND. ABS MAXI FUSE 4 BLK WIRE BLK/ WHT WIRE BLK/WHT WIRE BRAKE FUSE 18 BRAKE IND BRAKE PRESSURE WARNING SWITCH BRAKE SW OUTPUT BRAKE/ BRN WIRE DK GRN WIRE ELECTRONIC BRAKE CONTROL MODULE (LEFT FRONT SIDE OF FRAME) HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN OR START GAUGES FUSE 4 I/P FUSE BLOCK IGN ABS LAMP CONTROL BRAKE SW INPUT INLINE DIODE INSTRUMENT CLUSTER LEFT FRONT WHEEL SPEED SENSOR LFT FRT SENSOR (-) LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE PARK BRAKE WARNING SWITCH PNK WIRE PPL PPL/WHT WIRE PUMP MOTOR POWER PUMP MOTOR GROUND RED WIRE RIGHT FRONT WHEEL SPEED SENSOR RT FRT SENSOR (-) LFT FRT SENSOR (+) RT FRT SENSOR (+) TAN WIRE TAN/WHT WIRE TCC/ STOPLAMP SWITCH (ABOVE BRAKE PEDAL) UNDERHOOD FUSE-RELAY CENTER VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) VEHICLE SPEED SENSOR (LEFT SIDE OF TRANSMISSION) VEHICLE SPEED SIG VSS VSS SIG SERIAL DATA LINE SERIAL DATA SIGNAL BRAKE LAMP CONTROL EBCM GROUND W/O DRL W/DRL WHT TAN/ WIRE WHT WIRE YEL WIRE

1-2 SHIFT SOL 1-2 SHIFT SOLENOID 2-3 SHIFT SOL 2-3 SHIFT SOLENOID A/T ISS HI IN A/T ISS LO IN AUTO TRANSMISSION INPUT SHAFT SPEED SENSOR (INSIDE FRONT OF TRANSMISSION) AUTOMATIC TRANSMISSION BATTERY IN BLK WIRE BLK/WHT WIRE BLU/WHT WIRE BRAKE FUSE 18 BRAKE SWITCH ASSEMBLY (ON BRAKE PEDAL BRACKET) BRAKE SWITCH INPUT BRN WIRE BRN/WHT WIRE DATA CLASS II DK BLU WIRE ECM 1 FUSE ECM-B FUSE ECT SENS INPUT ENG 1 FUSE ENGINE COOLANT TEMP SENSOR (LEFT SIDE OR TOP FRONT OF ENGINE) GAUGES FUSE 4 GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START HOT IN RUN, START OR OFF I/P FUSE BLOCK IGNITION IN INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MALFUNCTION INDICATOR LAMP MIL CONTROL ORG/ WIRE PCM GROUND PCS SOL HI OUT PCS SOL LO OUT PNK (OR ORG) WIRE PNK WIRE PPL PPL DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) PPL/WHT WIRE PRESS CTRL SOLENOID RANGE SIGNAL "A" RANGE SIGNAL "B" RANGE SIGNAL "C" RED WIRE RED/BLK WIRE SENSOR GROUND SENSOR RETURN TAN/WHT WIRE TCC PWM SOL TCC PWM SOLENOID THROTTLE POSITION SENSOR (MOUNTED TO SIDE OF THROTTLE BODY) TP SENS INPUT TRANS FLUID TEMP SENSOR TRANS FUSE 20 TRANS RANGE PRESSURE SWITCH ASSEMBLY TRANS TEMP SIG IN UNDERHOOD FUSE/RELAY CENTER VEHICLE CONTROL MODULE (VCM) (ENGINE COMPT, LEFT FRONT FENDER APRON) VEHICLE SPEED SENSOR (LEFT REAR OF TRANSMISSION) VSS HI VSS LO YEL WIRE YEL/BLK WIRE

ABS IND. ABS MAXI FUSE 4 BLK WIRE BLK/WHT WIRE BRAKE FUSE 18 BRAKE IND BRAKE PRESSURE WARNING SWITCH BRAKE/ BRN WIRE DK GRN WIRE ELECTRONIC BRAKE CONTROL MODULE (LEFT FRONT SIDE OF FRAME) HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN OR START GAUGES FUSE 4 I/P FUSE BLOCK IGN ABS LAMP CONTROL BRAKE SW INPUT INLINE DIODE INSTRUMENT CLUSTER LFT FRT SENSOR (-) LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE PARK BRAKE WARNING SWITCH PNK WIRE PPL PPL/WHT WIRE PUMP MOTOR POWER PUMP MOTOR GROUND RED WIRE RIGHT FRONT WHEEL SPEED SENSOR RT FRT SENSOR (-) LFT FRT SENSOR (+) RT FRT SENSOR (+) TAN WIRE TAN/WHT WIRE TCC/ STOPLAMP SWITCH (ABOVE BRAKE PEDAL) UNDERHOOD FUSE-RELAY CENTER VEHICLE SPEED SENSOR (LEFT SIDE OF TRANSMISSION) LEFT FRONT WHEEL SPEED SENSOR VSS VSS SIG SERIAL DATA LINE SERIAL DATA SIGNAL BRAKE LAMP CONTROL EBCM GROUND W/O DRL W/DRL WHT TAN/ WIRE WHT WIRE YEL WIRE

1-2 SHIFT SOL 1-2 SHIFT SOLENOID 2-3 SHIFT SOL 2-3 SHIFT SOLENOID A/T ISS SENS HI IN A/T ISS SENS LO IN ACCELERATOR PEDAL POSITION (APP) MODULE (THROTTLE PEDAL MOUNT) APP 1 SIGNAL IN APP 2 SIGNAL IN APP 3 SIGNAL IN AUTO TRANSMISSION INPUT SHAFT SPEED SENSOR (INSIDE FRONT OF TRANSMISSION) AUTOMATIC TRANSMISSION BATTERY IN BLK WIRE BLK/WHT WIRE BRAKE FUSE 18 BRAKE SWITCH ASSEMBLY (ON BRAKE PEDAL BRACKET) BRAKE SWITCH IN BRN WIRE BRN/WHT WIRE CLASS II DATA DIESEL FUEL FUSE DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE ECM-B FUSE ECT SENSOR IN ENGINE COOLANT TEMP SENSOR (TOP FRONT OF ENGINE) GAUGES FUSE 4 GROUND GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START HOT IN RUN, BULB TEST OR START I/P FUSE BLOCK IGNITION IN INSTRUMENT CLUSTER LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MALFUNCTION INDICATOR LAMP MIL CONTROL ORG/ WIRE PCM GROUND PCS SOL HI OUT PCS SOL LO OUT PNK POWER WIRE PNK WIRE POWERTRAIN CONTROL MODULE (BEHIND CENTER OF DASH) PPL PPL DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) PPL/WHT WIRE PRESS CTRL HI SOLENOID RED WIRE RED/BLK WIRE SENSOR GROUND STOP FUSE 1 STOPLAMP SWITCH IN TAN/WHT WIRE TCC PWM SOL TCC PWM SOLENOID TFT SENSOR IN TRANS FLUID TEMP SENSOR TRANS FUSE 20 TRANS RANGE "A" TRANS RANGE "B" TRANS RANGE "C" TRANS RANGE PRESSURE SWITCH ASSEMBLY UNDERHOOD FUSE/RELAY CENTER VEHICLE SPEED SENSOR (VSS) BUFFER (LEFT SIDE OF DASH) VSS HI IN VSS IN VSS LO IN VSS OUT WHT WIRE YEL WIRE YEL/BLK WIRE

ABS IND. ABS MAXI FUSE 4 BLK WIRE BLK/ WHT WIRE BLK/WHT WIRE BRAKE FUSE 18 BRAKE IND BRAKE PRESSURE WARNING SWITCH BRAKE SW OUTPUT BRAKE/ BRN WIRE DK GRN WIRE ELECTRONIC BRAKE CONTROL MODULE (LEFT FRONT SIDE OF FRAME) HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN OR START GAUGES FUSE 4 I/P FUSE BLOCK IGN ABS LAMP CONTROL BRAKE SW INPUT INLINE DIODE INSTRUMENT CLUSTER LEFT FRONT WHEEL SPEED SENSOR LFT FRT SENSOR (-) LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE PARK BRAKE WARNING SWITCH PNK WIRE PPL PPL/WHT WIRE PUMP MOTOR POWER PUMP MOTOR GROUND RED WIRE RIGHT FRONT WHEEL SPEED SENSOR RT FRT SENSOR (-) LFT FRT SENSOR (+) RT FRT SENSOR (+) TAN WIRE TAN/WHT WIRE TCC/ STOPLAMP SWITCH (ABOVE BRAKE PEDAL) UNDERHOOD FUSE-RELAY CENTER VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) VEHICLE SPEED SENSOR (LEFT SIDE OF TRANSMISSION) VEHICLE SPEED SIG VSS VSS SIG SERIAL DATA LINE SERIAL DATA SIGNAL BRAKE LAMP CONTROL EBCM GROUND W/O DRL W/DRL WHT TAN/ WIRE WHT WIRE YEL WIRE

1-2 SHIFT SOL 1-2 SHIFT SOLENOID 2-3 SHIFT SOL 2-3 SHIFT SOLENOID A/T ISS HI IN A/T ISS LO IN AUTO TRANSMISSION INPUT SHAFT SPEED SENSOR (INSIDE FRONT OF TRANSMISSION) AUTOMATIC TRANSMISSION BATTERY IN BLK WIRE BLK/WHT WIRE BLU/WHT WIRE BRAKE FUSE 18 BRAKE SWITCH ASSEMBLY (ON BRAKE PEDAL BRACKET) BRAKE SWITCH INPUT BRN WIRE BRN/WHT WIRE DATA CLASS II DK BLU WIRE ECM 1 FUSE ECM-B FUSE ECT SENS INPUT ENG 1 FUSE ENGINE COOLANT TEMP SENSOR (LEFT SIDE OR TOP FRONT OF ENGINE) GAUGES FUSE 4 GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START HOT IN RUN, START OR OFF I/P FUSE BLOCK IGNITION IN INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MALFUNCTION INDICATOR LAMP MIL CONTROL ORG/ WIRE PCM GROUND PCS SOL HI OUT PCS SOL LO OUT PNK (OR ORG) WIRE PNK WIRE PPL PPL DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) PPL/WHT WIRE PRESS CTRL SOLENOID RANGE SIGNAL "A" RANGE SIGNAL "B" RANGE SIGNAL "C" RED WIRE RED/BLK WIRE SENSOR GROUND SENSOR RETURN TAN/WHT WIRE TCC PWM SOL TCC PWM SOLENOID THROTTLE POSITION SENSOR (MOUNTED TO SIDE OF THROTTLE BODY) TP SENS INPUT TRANS FLUID TEMP SENSOR TRANS FUSE 20 TRANS RANGE PRESSURE SWITCH ASSEMBLY TRANS TEMP SIG IN UNDERHOOD FUSE/RELAY CENTER VEHICLE CONTROL MODULE (VCM) (ENGINE COMPT, LEFT FRONT FENDER APRON) VEHICLE SPEED SENSOR (LEFT REAR OF TRANSMISSION) VSS HI VSS LO YEL WIRE YEL/BLK WIRE

ABS MAXI- FUSE AUX-A MAXI- FUSE AUX-B MAXI- FUSE HVAC MAXI- FUSE AUXILIARY BATTERY AUXILIARY BLOWER MOTOR HIGH SPEED RELAY AUXILIARY BLOWER MOTOR LOW SPEED RELAY AUXILIARY BLOWER MOTOR LOW SPEED RELAY AUXILIARY BLOWER MOTOR MEDIUM SPEED RELAY AUXILIARY BLOWER MOTOR MEDIUM SPEED RELAY BATTERY BATTERY JUNCTION BLOCK BLK WIRE BLOWER MOTOR BRAKE FUSE 18 BRN WIRE CONVENIENCE CENTER CRUISE CONTROL MODULE (GASOLINE) CRUISE CONTROL SWITCH CRUISE FUSE 6 DIESEL FUSIBLE LINK (10 GA-RUST) GASOLINE GENERATOR GLOW PLUG CONTROLLER HEATER AND A/C CONTROL LOGIC MODULE HEATER AND A/C CONTROLLER HTR A/C FUSE 12 I/P FUSE BLOCK IGN A MAXI FUSE IGN B MAXI FUSE IGNITION SWITCH INLINE FUSE LEFT POWER SIDE WINDOW SWITCH RIGHT POWER SIDE WINDOW SWITCH LOCK LOCK ELECTRONIC BRAKE CONTROL MODULE LOCK OFF LOCK OFF OFF NCA WIRE OFF ORG/ WIRE P/B BOOSTER FLUID FLOW ALARM PARK/ NEUTRAL POSITION SWITCH PNK WIRE PWR WDO CB B WIPER FUSE 12 RADIO RADIO 1 FUSE 17 REAR AUXILIARY HVAC CONTROL MODULE FRONT AUXILIARY HVAC CONTROL MODULE REAR AUXILIARY TEMPERATURE VALVE ASSEMBLY RED WIRE RESISTOR WINDSHIELD WASHER/ WIPER SWITCH FROM FUSE ABOVE RR BLOWER MINI FUSE RR HVAC FUSE 24 RUN WIRE STARTER RELAY STARTER SOLENOID TCC/ STOPLAMP SWITCH ELECTRONIC BRAKE CONTROL MODULE TO I/P FUSE BLOCK TO UNDERHOOD FUSE-RELAY CENTER TO UPFITTER PROVISION RELAY BELOW TRAILER WIRING PROVISION UNDERHOOD FUSE-RELAY CENTER UPFITTER PROVISION CONNECTOR UPFITTER PROVISION RELAY (BEHIND LEFT B PILLAR) VEHICLE CONTROL MODULE (GASOLINE) TEMPERATURE VALVE ACTUATOR MOTOR W/ UPFITTER PROVISIONS WARNING WHT WIRE WINDSHIELD WIPER MOTOR CONVENIENCE CENTER YEL WIRE

19 20 PNK WIRE 5-VOLT REFERENCE 999 999 SERVICE CIRCUIT POWER SERVICE CIRCUIT POWER A/C SIGNAL A/T INPUT SPEED SENSOR BATTERY BATTERY PRESSURE SW SIGNAL PRESSURE SW SIGNAL BLK WIRE BLK/WHT WIRE BLU WIRE BRAKE FUSE 18 BRN WIRE BRN/WHT WIRE CRUISE CONTROL MODULE (FRONT OF ENGINE COMPARTMENT NEAR LEFT FENDER) CRUISE CTRL SIG-ENG CYL. NO.1 CYL. NO.8 CYL. NO.2 CYL. NO.4 CYL. NO.5 CYL. NO.3 CYL. NO.6 CYL. NO.7 DATA LINK CONNECTOR (UNDER LEFT SIDE OF I/P) DISTRIBUTOR DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ELECTRONIC BRAKE CONTROL MODULE (EBCM) (LEFT FRAME RAIL NEAR CENTER OF VEHICLE) FORCE MOTOR FEED RETURN SIGNAL ELEC SPARK TIMING FUEL PUMP RLY FEED 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 GRY WIRE GVW OVER 8500 LBS. GVW UNDER 8500 LBS HIGH VOLTAGE COIL WIRE HOT IN RUN I/P FUSE BLOCK IGNITION IGNITION COIL (TOP RIGHT SIDE OF ENGINE) IGNITION COIL DRIVER (TOP RIGHT SIDE OF ENGINE) LT BLU/BLK WIRE LT BLU/WHT WIRE ORG/ WIRE PNK IGNITION WIRE PNK PNK 1 2 3 4 5 6 7 8 9 10 11 WIRE PNK WIRE PPL PPL 420 PPL PPL PPL PPL 420 1807 BRAKE SWITCH INPUT SERIAL DATA PRESSURE SW SIGNAL 5 VOLTS REFERENCE RADIO RED WIRE RED/BLK WIRE SENSOR GROUND SERIAL DATA SIGNAL FORCE MOTOR RETURN GROUND GROUND SENSOR GROUND SOLID STATE SPARK PLUGS SPEED SENSOR INPUT VCM SIGNAL STOPLAMP SWITCH INPUT TAN/WHT WIRE TCC SIGNAL TRANSMISSION ONLY) (LEFT SIDE OF TRANSMISSION) VEHICLE CONTROL MODULE (ENGINE COMPARTMENT, LEFT FENDER) VSS SIGNAL VSS SIGNAL OUTPUT VSS SIGNAL OUTPUT MAL FUNC LP OUTPUT 389 419 WHT WIRE WHT/BLK WIRE

27 28 29 30 31 PPL BLK WIRE BLU WIRE BRAKE FUSE 18 BRN WIRE BRN/WHT WIRE DIESEL FUEL FUSE DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DK PNK PNK/ LT WIRE ELECTRONIC BRAKE CONTROL MODULE (LEFT FRAME RAIL, NEAR CENTER OF VEHICLE) FUEL INJECTION PUMP ENCODER (TOP OF ENGINE) FUEL SHUTOFF VALVE SOLENOID FUEL SOLENOID DRIVER FUEL TEMP. GRN WIRE GRY WIRE HIGH LOW HOT AT ALL TIMES HOT IN HOT IN RUN OR START I/P FUSE BLOCK LOW HIGH LT BLU WIRE LT GRN WIRE LT LT ORG/ WIRE ORG/BLK WIRE PNK PNK 8 9 WIRE PNK PNK PPL 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 WIRE PNK WIRE PNK/BLK WIRE PPL RED WIRE RED/BLK WIRE RUN WIRE STOP FUSE 1 TAN WIRE TAN/BLK WIRE TCC/STOPLAMP SWITCH (AT REAR OF BRAKE PEDAL SUPPORT BRACKET) TIMING STEPPER MOTOR (TOP FRONT OF ENGINE) TRANS FUSE 20 UNDERHOOD FUSE-RELAY CENTER WHT WIRE YEL WIRE YEL/BLK WIRE

BLK WIRE BLK/WHT WIRE BRAKE FUSE 18 BRN WIRE BRN/WHT WIRE DK BLU WIRE DK GRN WIRE ENGINE COOLANT TEMPERATURE SENSOR (TOP FRONT OF ENGINE) FUEL GAUGE FUEL PUMP, SENDER (ON TOP OF FUEL TANK) FUEL PUMP/ OIL PRESSURE SWITCH (ON ENGINE BLOCK, TOP REAR, BEHIND DISTRIBUTOR) GAUGES FUSE 4 GRY WIRE HOT IN RUN HOT IN RUN, BULB TEST OR START I/P FUSE BLOCK INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR (TOP RIGHT SIDE OF ENGINE) MASS AIR FLOW SENSOR (TOP FRONT OF ENGINE, IN FRESH AIR INTAKE DUCT) NCA WIRE OIL PRESS GAUGE ORG/ WIRE PNK PNK PNK 4 5 6 WIRE PNK WIRE PPL PPL PNK PNK PNK 1 2 3 4 5 6 WIRE RED WIRE RED/BLK WIRE SERVICE ENGINE SOON INDICATOR SPEED METER TAN WIRE TCC/STOP- LAMP SWITCH (UNDER LEFT SIDE OF I/P, ON BRAKE PEDAL SUPPORT BRACKET) THROTTLE POSITION SENSOR (ON SIDE OF THROTTLE BODY) WHT WIRE YEL WIRE