GMC Sierra 2500 (2000-2004) auxiliary battery relay Wiring diagrams

4.3L A/C AUTOMATIC RECIRCULATING SWITCH A/C COMPRESSOR CLUTCH A/C COMPRESSOR LOW PRESSURE CYCLING SWITCH ALL OTHER GAS AUXILIARY BATTERY RELAY BANK 1 SENSOR 1 BANK 2 SENSOR 1 BANK 1 SENSOR 2 BANK 2 SENSOR 2 BLK WIRE BLK/WHT WIRE BODY WIRING HARNESS JUNCTION BLOCK (UNDER LEFT SIDE OF DASH) BRAKE FLUID LEVEL SWITCH CANADA CRUISE CONTROL MODULE DATA LINK CONNECTOR (DLC) ELECTRONIC BRAKE CONTROL MODULE (EBCM) ENGINE COOLANT LEVEL SWITCH ENGINE WIRING HARNESS JUNCTION BLOCK (LEFT SIDE OF ENG COMPT) ENGINE WIRING HARNESS JUNCTION BLOCK (LEFT SIDE OF ENGINE COMPT) FRONT AXLE ACTUATOR/ SWITCH FUEL PUMP RELAY G110 (4.8L, 5.3L, 6.0L) (LEFT FRONT OF ENGINE) GAS HEADLAMP RELAY HEATED OXYGEN SENSOR HEATED OXYGEN SENSOR HEATED OXYGEN SENSOR IGN 1 RELAY IGNITION COIL MODULE ENGINE OIL LEVEL SWITCH IGNITION COILS (LEFT BANK) IGNITION COILS (RIGHT BANK) INSTRUMENT CLUSTER LEFT BATTERY LEFT DAYTIME RUNNING LAMP (DRL) LEFT FOG LAMP LEFT HORN (LOW) LEFT PARK/ TURN LAMP LOW WASHER SWITCH MASS AIRFLOW (MAF) SENSOR NCA WIRE PARK/ NEUTRAL POSITION SWITCH THROTTLE ACTUATOR CONTROL MODULE RIGHT BATTERY RIGHT DAYTIME RUNNING LAMP (DRL) RIGHT FOG LAMP RIGHT HORN RIGHT PARK/ TURN LAMP SECONDARY AIR INJECTION REACTION SOLENOID STARTER RELAY TRANSFER CASE SWITCH UNDERHOOD LAMP VEHICLE CONTROL MODULE (VCM)/ POWERTRAIN CONTROL MODULE (PCM) VSS SHIELD (4.3L) W/ATC W/O ATC WHT WIRE WINDSHIELD WASHER PUMP WINDSHIELD WIPER MOTOR MODULE

4.3L ENGINE 5.3L FLEX FUEL A/C COMPRESSOR CLUTCH A/C LOW PRESSURE SWITCH AUXILIARY BATTERY RELAY BATTERY (LEFT) BATTERY (RIGHT) BLK WIRE BLK/WHT WIRE BRAKE FLUID LEVEL SWITCH BRAKE PRESSURE DIFFERENTIAL SWITCH COOLANT LEVEL SWITCH DAYTIME PARK/TURN RUNNING SIGNAL LAMP (DRL) LAMP (LEFT) (LEFT FRONT) DAYTIME RUNNING LAMP (DRL) (RIGHT) DIESEL ENGINE CONTROL MODULE EXCEPT 4.3L BASE EXCEPT 4.3L ENGINE F/PMP RELAY FOG LAMP (LEFT) FUEL COMPOSITION SENSOR GAS GAS (LEFT REAR OF ENGINE BLOCK) GAS EXC 4.3L GAS W/AUX BATTERY HIGH BEAM HEADLAMP (LEFT) HIGH BEAM HEADLAMP (RIGHT) HORN (LEFT) HORN (RIGHT) LOW BEAM FOG HEADLAMP LAMP (RIGHT) (RIGHT) IGN 1 RELAY (GAS) IGNITION COIL 2 IGNITION COIL 5 IGNITION COIL 7 IGNITION IGNITION COIL 1 COIL 3 IGNITION IGNITION COIL 6 COIL 4 IGNITION IGNITION CONTROL COIL 8 MODULE LOW BEAM HEADLAMP (LEFT) MOBILE RADIO FUSE BLOCK PARK/ NEUTRAL POSITION SWITCH PARK/TURN SIGNAL LAMP (RIGHT FRONT) POWER TAKEOFF CONNECTOR (BLUNT CUT) THROTTLE ACTUATOR CONTROL MODULE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) UPFITTER OPTION W/ DUAL HORNS W/AUX BATTERY W/PTO WASHER FLUID LEVEL SENSOR WHT WIRE WINDSHIELD WASHER FLUID PUMP

5.3L FLEX FUEL A/C COMPRESSOR CLUTCH A/C LOW PRESSURE SWITCH ACTIVE, ELECT SHIFT TRANSFER CASE ACTIVE, MANUAL SHIFT TRANSFER CASE AUXILIARY BATTERY RELAY BATTERY (LEFT) BATTERY (RIGHT) BLK WIRE BRAKE FLUID LEVEL SWITCH BRAKE PRESSURE DIFFERENTIAL SWITCH COOLANT LEVEL SWITCH DAYTIME RUNNING LAMP (DRL) (LEFT) DAYTIME RUNNING LAMP (DRL) (RIGHT) DIESEL ELECTRONIC BRAKE CONTROL MODULE EXCEPT 4.3L BASE F/PMP RELAY FOG LAMP (LEFT) FUEL COMPOSITION SENSOR FUEL PUMP FUEL PUMP, SENDER ASSEMBLY (SECONDARY) GAS GAS (LEFT REAR OF ENGINE BLOCK) GAS EXC 4.3L GAS W/AUX BATTERY HIGH BEAM HEADLAMP (LEFT) HORN (LEFT) HORN (RIGHT) FOG LAMP (RIGHT) IGN 1 RELAY (GAS) INFLATABLE RESTRAINT PASSENGER PRESENSE MODULE INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE LOW BEAM HEADLAMP (LEFT) LOW BEAM HIGH BEAM HEADLAMP HEADLAMP (RIGHT) (RIGHT) MANUAL SHIFT TRANSFER CASE NCA WIRE PARK/TURN SIGNAL LAMP (LEFT FRONT) PARK/TURN SIGNAL LAMP (RIGHT FRONT) POWER TAKEOFF CONNECTOR (BLUNT CUT) REAR WHEEL STEERING CONTROL MODULE ROOF BEACON RELAY ROOF MOUNTED BEACON (BLUNT CUT) THROTTLE ACTUATOR CONTROL MODULE TRANSFER CASE SHIFT CONTROL SWITCH TRANSFER CASE SHIFT FRONT CONTROL AXLE MOTOR ACTUATOR UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT, NEAR BATTERY) W/ DUAL HORNS W/AUX BATTERY W/PTO WASHER FLUID LEVEL SENSOR WINDSHIELD WASHER FLUID PUMP

44 19 (DIESEL) (GAS) AIR TEMPERATURE ACTUATOR ALL OTHER GAS 4.3L ALL OTHER GAS 4.3L FUEL INJECTOR PNK PNK CONTROL MODULE WIRE AUXILIARY BATTERY RELAY BASE BLK WIRE BRAKE FUSE BRN WIRE DIESEL DIESEL GAS DIESEL GAS BLOWER MOTOR SWITCH (MANUAL) ECM PRV FUSE (DIESEL) ENGINE CONTROL MODULE (ECM)/ PNK PNK POWERTRAIN CONTROL MODULE (PCM) WIRE ETC FUSE FROM CRUISE FUSE (DIAGRAM 2 OF 4) FROM ENG 1 FUSE (DIAGRAM 2 OF 4) FROM ECM B FUSE (DIAGRAM 1 OF 4) FROM FUSE LINK (DIAGRAM 1 OF 4) FROM IGN C FUSE (DIAGRAM 2 OF 4) FRONT AXLE ACTUATOR FRONT PASSENGER HEATED SEAT SWITCH FUEL FUEL FUEL INJECTOR 4 INJECTOR 2 INJECTOR 8 FUEL INJECTOR 1 FUEL INJECTOR 3 FUEL INJECTOR 5 FUEL INJECTOR 6 FUEL INJECTOR 7 FUSE GAS HTR A/C FUSE HVAC 1 FUSE HVAC CONTROL MODULE IGN 1 RELAY IGN 3 FUSE IGNITION COIL 1 IGNITION COIL 3 IGNITION COIL 5 IGNITION IGNITION COIL 2 COIL 4 IGNITION IGNITION COIL COIL 7 IGNITION IGNITION IGNITION COIL 8 COIL 6 COIL MODULE INJ A FUSE INJ B FUSE MEGA FUSE MEMORY DRIVER SEAT HEATED MODULE SEAT SWITCH UPLEVEL MODE ACTUATOR NCA WIRE PNK PNK PNK WIRE PNK PNK WIRE PNK WIRE REAR REAR WHEEL WHEEL STEERING STEERING SWITCH CONTROL MODULE RECIRCULATION ACTUATOR RECIRCULATION AIR MODE ACTUATOR TEMPERATURE ACTUATOR ACTUATOR RED WIRE RIGHT BATTERY RIGHT BATTERY FUSIBLE LINK RIGHT I/P FUSE BLOCK (ON LOWER RIGHT SIDE OF DASH) STOPLAMP ELECTRONIC SWITCH BRAKE CONTROL MODULE (EBCM) THROTTLE ACTUATOR CONTROL MODULE TRANSFER CASE SHIFT CONTROL MODULE UNDER- HOOD FUSE BLOCK (ON LEFT SIDE OF ENGINE COMPT)

2-HI IND 4-HI IND 4-LO IND ATC FUSE AUTO AUXILIARY BATTERY RELAY B+ MOTOR (CCW) MOTOR (CW) GND BLK WIRE BLK/WHT WIRE BODY RELAY BLOCK (UNDER LEFT SIDE OF DASH) BRAKE CONTROL BRN WIRE BRN/WHT WIRE CONTROL MODULE CTRL DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE ENCODER LOGIC ENCODER MOTOR ENCODER RTN FRONT AXLE ACTUATOR FRONT PROP- SHAFT SPEED SENSOR FT SHAFT SIG FT SHAFT RTN FUSE GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN HOT IN RUN, START ILLUMINATION LAMP (2) INSTRUMENT PANEL CLUSTER LAMP LEFT I/P FUSE BLOCK (LOWER LEFT SIDE OF DASH) LOCK SOL OUT LOGIC LT BLU WIRE LT GRN/BLK WIRE MODULE GND 4-LO IND 4-HI IND NEUTRAL IND FT AXLE CTRL RR SHAFT SIG RR SHAFT RTN NCA WIRE NEUTRAL IND ORG/ WIRE PNK WIRE PPL PPL/WHT WIRE REAR PROP- SHAFT SPEED SENSOR RED WIRE RED/WHT WIRE REF RUN WIRE SHIFT MOTOR SOLID STATE SPLICE PACK TAN WIRE TAN/BLK WIRE TRANSFER CASE SHIFT CONTROL MODULE (BEHIND HEADLAMP SWITCH) TRANSFER CASE SHIFT CONTROL SWITCH UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT, NEAR BATTERY) YEL WIRE YEL/BLK WIRE

2-HI IND 4-HI IND 4-LO IND 4.3L 4.8L, 5.3L, 6.0L ATC FUSE AUTO AUXILIARY BATTERY RELAY AWD IND B+ MOTOR (CCW) MOTOR (CW) GND BLK WIRE BLK/WHT WIRE BODY WIRING HARNESS JUNCTION BLOCK BRAKE CONTROL BRN WIRE BRN/WHT WIRE CONTROL MODULE CTRL DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE ENCODER MOTOR ENCODER RTN ENGINE WIRING HARNESS JUNCTION BLOCK FRONT AXLE ACTUATOR/ SWITCH FRONT PROP- SHAFT SPEED SENSOR FT SHAFT SIG FT SHAFT RTN FUSE FUSE BLOCK GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN HOT IN RUN, START ILLUMINATION LAMP (2) INDICATOR LAMP INSTRUMENT CLUSTER LOCK SOL OUT LOGIC LT BLU WIRE LT GRN/BLK WIRE MODULE GND 4-LO IND 4-HI IND NEUTRAL IND FT AXLE CTRL RR SHAFT SIG RR SHAFT RTN NCA WIRE NEUTRAL IND ORG/ WIRE PNK WIRE PPL PPL/WHT WIRE REAR PROP- SHAFT SPEED SENSOR ENCODER LOGIC RED WIRE RED/WHT WIRE REF RUN WIRE SHIFT MOTOR SOLID STATE SPLICE PACK TAN WIRE TAN/BLK WIRE TRANSFER CASE SELECT SWITCH YEL WIRE YEL/BLK WIRE

2-HI IND 4-HI IND 4-LO IND 4.3L 4.8L, 5.3L, 6.0L ATC FUSE AUTO AUXILIARY BATTERY RELAY AWD IND B+ MOTOR (CCW) MOTOR (CW) GND BLK WIRE BLK/WHT WIRE BODY WIRING HARNESS JUNCTION BLOCK BRAKE CONTROL BRN WIRE BRN/WHT WIRE CONTROL MODULE CTRL DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE ENCODER MOTOR ENCODER RTN ENGINE WIRING HARNESS JUNCTION BLOCK FRONT AXLE ACTUATOR/ SWITCH FRONT PROP- SHAFT SPEED SENSOR FT SHAFT SIG FT SHAFT RTN FUSE FUSE BLOCK GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN HOT IN RUN, START ILLUMINATION LAMP (2) INDICATOR LAMP INSTRUMENT CLUSTER LOCK SOL OUT LOGIC LT BLU WIRE LT GRN/BLK WIRE MODULE GND 4-LO IND 4-HI IND NEUTRAL IND FT AXLE CTRL RR SHAFT SIG RR SHAFT RTN NCA WIRE NEUTRAL IND ORG/ WIRE PNK WIRE PPL PPL/WHT WIRE REAR PROP- SHAFT SPEED SENSOR ENCODER LOGIC RED WIRE RED/WHT WIRE REF RUN WIRE SHIFT MOTOR SOLID STATE SPLICE PACK TAN WIRE TAN/BLK WIRE TRANSFER CASE SELECT SWITCH YEL WIRE YEL/BLK WIRE