GMC Sierra 3500 (2002-2006) Ground distribution circuit

4.3L ENGINE 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 RUNNING LAMP (DRL) (RIGHT) DAYTIME WINDSHIELD RUNNING WASHER LAMP (DRL) FLUID (LEFT) PUMP DIESEL EXCEPT 4.3L BASE EXCEPT 4.3L ENGINE EXCEPT 8.1L 8.1L F/PMP RELAY FOG LAMP (LEFT) GAS GAS EXC 4.3L HIGH BEAM HEADLAMP (LEFT) HIGH BEAM LOW BEAM HEADLAMP HEADLAMP (RIGHT) (RIGHT) HORN (LEFT) HORN (RIGHT) FOG LAMP (RIGHT) IGN 1 RELAY (GAS) IGNITION COIL 8 IGNITION CONTROL MODULE IGNITION IGNITION COIL 1 COIL 3 IGNITION IGNITION COIL 7 COIL 5 IGNITION IGNITION IGNITION COIL 6 COIL 4 COIL 2 LOW BEAM HEADLAMP (LEFT) PARK/TURN SIGNAL LAMP (LEFT FRONT) PARK/TURN SIGNAL LAMP (RIGHT FRONT) POWER TAKE OFF CONNECTOR (BLUNT CUT) STARTER RELAY (DIESEL) 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

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

8.1L 8.1L (W/ ALLISON) TRANSMISSION CONTROL MODULE ACTIVE, ELECT SHIFT TRANSFER CASE ACTIVE, MANUAL SHIFT TRANSFER CASE BLK WIRE BLK/WHT WIRE BUCKET CKP SENSOR SHIELD CMP SENSOR SHIELD CREW CAB CREW CAB CREW CAB DIESEL DRIVER SEAT ADJUSTER SWITCH ELECTRONIC BRAKE CONTROL MODULE ENGINE OIL LEVEL SWITCH EXC 8.1L W/O CALIF LEV EXCEPT 8.1L EXCEPT 8.1L 8.1L EXCEPT CREW CAB FRONT AXLE ACTUATOR FUEL HEATER FUEL PRESSURE REGULATOR SHIELD FUEL PRESSURE SENSOR SHIELD FUEL PUMP FUEL PUMP, SENDER ASSEMBLY (PRIMARY) FUEL PUMP, SENDER ASSEMBLY (SECONDARY) GAS GLOW PLUG CONTROL MODULE GRN WIRE INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE INTAKE AIR TEMPERATURE (IAT)/MASS AIRFLOW (MAF) SENSOR LEFT REAR WINDOW DOOR SWITCH) LATCH (LEFT REAR) ASSEMBLY LT GRN WIRE MANUAL SHIFT TRANSFER CASE MEMORY SEAT MODULE NCA WIRE NON- BUCKET PARK/ NEUTRAL POSITION SWITCH POWERTRAIN CONTROL MODULE RED WIRE RIGHT REAR REAR DOOR WINDOW LATCH DEFOGGER ASSEMBLY GRID SEAT BOLSTER/ LUMBAR SWITCH (FRONT PASSENGER) SEAT MEMORY ADJUSTER SEAT SWITCH MODULE (PASSENGER) (DRIVER) TRANSFER CASE SHIFT CONTROL MOTOR TRANSFER CASE SHIFT CONTROL SWITCH WATER IN-FUEL SENSOR WHT WIRE WINDOW DRIVER SWITCH SEAT (RIGHT ADJUSTER REAR) SWITCH

AVALANCHE/ ESCALADE EXT BLK WIRE BLK/WHT WIRE CENTER HIGH MOUNT STOP LAMP DOOR COURTESY LAMP (LEFT REAR) DOOR COURTESY LAMP (RIGHT REAR) ELECTRONIC SUSPENSION CONTROL MODULE ESCALADE EXT EXC 8.1L W/O CALIF LEV EXC ESCALADE EXT HEATED HEATED SEAT SEAT MODULE ELEMENT (LEFT REAR) (LEFT REAR) HEATED SEAT ELEMENT (RIGHT REAR) HEATED SEAT MODULE (RIGHT REAR) IGNITION COIL 1 IGNITION COIL 5 IGNITION IGNITION COIL 2 COIL 6 IGNITION IGNITION COIL 3 COIL 7 IGNITION IGNITION COIL 4 COIL 8 INTAKE AIR TEMPERATURE (IAT)/MASS ENGINE AIRFLOW (MAF) OIL LEVEL SENSOR SWITCH MEMORY SEAT MODULE (PASSENGER) MINI WEDGE (DOOR JAMB SWITCH) (LEFT REAR) MINI WEDGE (DOOR JAMB SWITCH) (RIGHT REAR) NCA WIRE PARK/ NEUTRAL POSITION SWITCH POWERTRAIN CONTROL MODULE REAR OBJECT SENSOR CONTROL MODULE REAR PARKING ASSIST DIAGNOSTIC CONNECTOR REAR WINDOW DEFOGGER GRID ROOF MEMORY WINDOW BEACON SEAT SWITCH) RELAY MODULE (LEFT REAR) ROOF MOUNTED BEACON (BLUNT CUT) WHT WIRE WINDOW CONTACTOR WINDOW SWITCH (RIGHT REAR)

AUDIO AMPLIFIER BACK-UP ALARM BACKUP LAMP (LEFT) BACKUP LAMP- RIGHT BLK WIRE BLK/WHT WIRE CAMPER/ CHEVY GMC CHEVY GMC CLEARANCE LAMPS CRUISE CONTROL MODULE DATA LINK CONNECTOR DIGITAL RADIO RECEIVER EXCEPT LUXURY FOUR WHEEL STEERING FOUR WHEEL STEERING FROM I/P RELAY BLOCK (DIAGRAM 3 OF 4) HAZARD LAMPS SWITCH HEADLAMP SWITCH HVAC BODY CONTROL CONTROL MODULE MODULE I/P FUSE BLOCK (LOWER LEFT SIDE OF DASH) I/P JUNCTION BLOCK (RIGHT SIDE OF DASH) I/P RELAY BLOCK (NEAR LEFT KICK PANEL) I/P RELAY BLOCK (NEAR LEFT KICK PANEL) TO I/P RELAY BLOCK (DIAGRAM 3 OF 4) IGNITION KEY ALARM TOW/HAUL SWITCH SWITCH INFLATABLE RESTRAINT STEERING WHEEL MODULE COIL LEFT LEFT REAR TURN SIGNAL LAMP LICENSE LAMP (RIGHT) LICENSE LAMP- LEFT LUXURY (IN CONSOLE HARNESS) MULTI- TRACTION FUNCTION CONTROL ACCESSORY SWITCH SWITCH NCA WIRE RADIO TURN SIGNAL/ HAZARD FLASHER MODULE REAR LAMPS JUNCTION BLOCK (INSIDE OF LEFT REAR FRAME RAIL) REMOTE PLAYBACK DEVICE REAR SEAT (CD AUDIO AUDIO PLAYER) AMPLIFIER CONTROLLER RIGHT RIGHT REAR TURN SIGNAL LAMP STEERING TRANSMISSION WHEEL SHIFT SPEED/ POSITION SELECT SENSOR SWITCH TAIL/STOP LAMP (LEFT) TAIL/STOP LAMP-RIGHT) TAILGATE MARKER LAMP TAN WIRE TRAILER WIRING PROVISION TRANSFER CASE SHIFT CONTROL MODULE DIGITAL RADIO RECEIVER TURN SIGNAL/ MULTIFUNCTION SWITCH VEHICLE REAR SEAT COMMUNICATION ENTERTAINMENT INTERFACE ASSEMBLY MODULE WHT WIRE WINDOW/ DOOR LOCK SWITCH (PASSENGER)

A/T INSTRUMENT SHIFT PANEL HEADLAMP LOCK CLUSTER SWITCH SOLENOID AIR TEMPERATURE SENSOR ASSEMBLY (INSIDE FRONT) AIR TEMPERATURE SENSOR ASSEMBLY (INSIDE REAR) ANALOG CLOCK AUTO A/C AUTO A/C EXC AVALANCHE/ ESCALADE EXT AUXILIARY POWER OUTLET (BIN) AUXILIARY POWER OUTLET (CONSOLE) AUXILIARY POWER OUTLET (FRONT) BLK WIRE BLOWER MOTOR BLOWER MOTOR RECIRCULATION RESISTOR ACTUATOR ASSEMBLY BOSE EXC LUXURY CIGAR LIGHTER CLEARANCE LAMPS CLEARANCE SWITCH COURTESY LAMP ("B" PILLAR) COURTESY LAMP (RIGHT) DOME LAMP (FRONT) DOME READING CENTER LAMP HIGH (REAR) MOUNTED STOP LAMP DRIVER DOOR MODULE EXC CAD EXT CAD FRONT PASSENGER DOOR MODULE HEATED SEAT SWITCH (LEFT REAR) HEATED SEAT SWITCH (RIGHT REAR) HVAC CONTROL ASSEMBLY (FRONT AUXILIARY) HVAC CONTROL MODULE I/P COMPARTMENT LAMP I/P RELAY BLOCK (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) INSIDE REARVIEW MIRROR LEFT I/P FUSE BLOCK (LOWER LEFT SIDE OF DASH) LUXURY MAN A/C OVERHEAD CONSOLE READING LAMP (REAR) REAR WHEEL STEERING SWITCH RIGHT I/P FUSE BLOCK (LOWER RIGHT SIDE OF DASH) ROOF BEACON SWITCH ROOF MARKER I/P LAMP COURTESY (LEFT) LAMP (LEFT) DATA LINK CONNECTOR ROOF MARKER LAMP (RIGHT) SUNROOF RELAY TRANSFER CASE SHIFT CONTROL SWITCH UNDERHOOD LAMP SUNROOF MOTOR UNLOCK LOCK RELAY RELAY VISOR LAMP (LEFT) VISOR LAMP (RIGHT) WINDSHIELD WIPER MOTOR MODULE

A/T SHIFT LOCK SOLENOID AUTO A/C AUXILIARY POWER OUTLET (BIN) AUXILIARY POWER OUTLET (CONSOLE) AUXILIARY POWER OUTLET (FRONT) BLK WIRE BLOWER MOTOR CONTROL PROCESSOR BLOWER MOTOR RESISTOR ASSEMBLY CIGAR LIGHTER CLEARANCE LAMPS DOME CENTER LAMP HIGH (FRONT) MOUNTED STOP LAMP EXC LUXURY HD TRAILERING ROOF EQUIPMENT MARKER PROVISION LAMP (LEFT) HEADLAMP SWITCH HVAC CONTROL MODULE I/P FUSE BLOCK (LOWER LEFT SIDE OF DASH) I/P JUNCTION BLOCK (LOWER RIGHT SIDE OF DASH) I/P RELAY BLOCK (NEAR LEFT KICK PANEL) INSIDE REARVIEW MIRROR LUXURY MAN A/C OVERHEAD CONSOLE PNK WIRE REAR WHEEL STEERING SWITCH RIGHT COOLING FAN RECIRCULATION ACTUATOR ROOF MARKER LAMP (RIGHT) SUNROOF SUNROOF CONTROL SWITCH MODULE DATA LINK CONNECTOR UNDERHOOD COOLING FAN FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) COOL/FAN RELAY VANITY DOME/ READING MIRROR LAMP LAMP (REAR) (RIGHT) VANITY MIRROR LAMP (LEFT) W/ 5 LAMP ROOF MARKER W/O 5 LAMP ROOF MARKER WINDSHIELD WIPER INSTRUMENT MOTOR PANEL MODULE CLUSTER

BLK WIRE BLK/WHT WIRE COLUMN SHIFT DATA LINK CONNECTOR DIGITAL RADIO RECEIVER EXC LUXURY HEADLAMP SWITCH HVAC CONTROL MODULE I/P RELAY BLOCK (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) IGNITION KEY ALARM SWITCH INFLATABLE RESTRAINT STEERING WHEEL MODULE COIL LEFT I/P FUSE BLOCK (LOWER LEFT SIDE OF DASH) LUXURY MULTIFUNCTION TRACTION ACCESSORY CONTROL SWITCH SWITCH NCA WIRE RADIO REAR PARKING ASSIST DISABLE SWITCH REAR SEAT AUDIO AUDIO AMPLIFIER CONTROLLER REAR SEAT ENTERTAINMENT ASSEMBLY REMOTE PLAYBACK DEVICE (CD PLAYER) STEERING WHEEL DIC CONTROLS STEERING WHEEL SPEED/ POSITION SENSOR TAN WIRE THEFT DETERRENT CONTROL MODULE TOW/HAUL SWITCH TRANSFER CASE SHIFT CONTROL MODULE TRANSMISSION SHIFT SELECT SWITCH TURN SIGNAL/ HAZARD FLASHER MODULE TURN SIGNAL/ MULTIFUNCTION SWITCH VEHICLE COMMUNICATION INTERFACE MODULE VEHICLE REAR SEAT COMMUNICATION ENTERTAINMENT INTERFACE ASSEMBLY MODULE WHT WIRE WINDSHIELD HAZARD WIPER/WASHER LAMPS SWITCH SWITCH

AUTO A/C AUTOMATIC LEVEL CONTROL COMPRESSOR AUXILIARY REAR OBJECT POWER SENSOR OUTLET CONTROL (REAR) MODULE BACKUP LAMP- RIGHT BLK WIRE BLOWER MOTOR (REAR AUXILIARY) CARGO DOOR DOOR AJAR KEY SWITCH SWITCH (CARGO) CENTER HIGH MOUNT CONTROL STOP LAMP CLEARANCE CLEARANCE LAMP LAMP (LEFT (RIGHT FRONT) REAR) CLEARANCE LAMP (LEFT REAR) DOME LAMP ("D" PILLAR) DOOR CONTACT PLATE (LEFT CARGO BODY) DOOR CONTACT PLATE (LEFT CARGO DOOR) DOOR CONTACT PLATE (RIGHT CARGO BODY) DOOR CONTACT PLATE (RIGHT CARGO DOOR) ELECTRONIC SUSPENSION CONTROL MODULE ESCALADE EXC AVALANCE/ ESCALADE EXT ESCALADE FOUR WHEEL STEERING HVAC BLOWER CONTROL MOTOR ASSEMBLY (REAR (REAR AUXILIARY) AUXILIARY) HVAC CONTROL ASSEMBLY (REAR AUXILIARY) HVAC CONTROL ASSEMBLY BLOWER (REAR MOTOR AUXILIARY) (AUXILIARY) ID LAMP LAMP (RIGHT FRONT) LICENSE LAMP (RIGHT) LICENSE LAMP- LEFT LIFTGATE AJAR SWITCH LIFTGATE AJAR SWITCH (LEFT) LIFTGATE AJAR SWITCH (RIGHT) LIFTGATE KEY SWITCH MODE AIR ACTUATOR TEMPERATURE (REAR) ACTUATOR REAR A/C W/AUX HEATER REAR A/C W/O AUX HEATER REAR LAMPS JUNCTION BLOCK (INSIDE OF LEFT REAR FRAME RAIL) REAR PARKING ASSIST DIAGNOSTIC CONNECTOR REAR WINDOW DEFOGGER GRID REAR WINDOW DEFOGGER GRID (LEFT CARGO) REAR WINDOW DEFOGGER GRID (RIGHT CARGO) SPLICE PACK STOP/TURN SIGNAL LAMP (RIGHT) STOP/TURN TAIL/STOP SIGNAL LAMP LAMP) (LEFT) (LEFT) SUBURBAN TAIL/STOP LAMP (RIGHT) BACKUP LAMP (LEFT) TRAILER CONNECTOR W/ CARGO DOORS W/CARGO DOORS W/LIFTGATE WIPER MODULE (REAR)