GMC Cab & Chassis Sierra 3500 HD (2008-2012) mega fuse Wiring diagrams

A/C COMPRESSOR ACCESSORY DC POWER CONTROL MODULE ACCM FUSE 3 ACPO FUSE 1 AUTOMATIC TRANSMISSION AUXILIARY FLUID PUMP CONTROL MODULE BECM FAN FUSE 2 BECM FUSE 10 CAB HTR PUMP RELAY COOL PUMP RELAY DK BLU WIRE DRIVE MOTOR GENERATOR BATTERY CONTROL MODULE DRIVE MOTOR GENERATOR POWER INVERTER MODULE ELECTRONIC POWER STEERING MOTOR CONTROL MODULE EPS FUSE 7 FAN 1 FUSE FAN CNTRL RELAY FAN HI RELAY FAN MID 2 RELAY FAN MID FAN LO RELAY 1 RELAY FAN-2 FUSE FROM ENG FUSE 4 (DIAGRAM 6 OF 7) FROM RIGHT BATTERY (DIAGRAM 1 OF 7) FROM UNDERHOOD FUSE BLOCK (DIAGRAM 6 OF 7) FUEL FUEL FUEL INJECTOR INJECTOR INJECTOR FUEL INJECTOR GENERATOR BATTERY VENT FAN RELAY DRIVE MOTOR GENERATOR BATTERY IGNITION COIL 2 IGNITION IGNITION IGNITION COIL 4 COIL 6 COIL 8 INJ-B FUSE 13 (EXCEPT 4.3L) MEGA FUSE NCA WIRE PIM 1 FUSE 8 PIM 2 FUSE 9 PNK WIRE PNK/WHT WIRE PPL RED WIRE RED/WHT WIRE SERIAL DATA GATEWAY (SDG) MODULE TRANS PUMP FUSE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT WIRE

4.3L EXCEPT 4.3L BLK WIRE BODY CONTROL MODULE (BCM) (LOWER LEFT SIDE OF DASH) BRN WIRE CHARGE IND SIG CHARGE INDICATOR COMPUTER DATA LINES SYSTEM CURRENT SPLY DATA BUS - DK GRN WIRE DRIVER INFORMATION CENTER (DIC) ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT) GENERATOR B+ GENERATOR SIG GRY WIRE HOT AT ALL TIMES IGN INSTRUMENT PANEL CLUSTER (IPC) IPC FUSE 46 LOGIC LOW REF MEGA FUSE MEGA FUSE (RIGHT REAR OF ENGINE COMPT) PNK WIRE POWER DISTRIBUTION SYSTEM POWER SUPPLY RED WIRE RED/WHT WIRE RIGHT BATTERY SENS SIG SERIAL DATA TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) UNDERHOOD FUSE HOLDER (ON POSITIVE BATTERY TERMINAL) VOLT W/ 10 SERIES WHT WIRE

2 MODE HYBRID 6 SPEED A/T 4.3L EXCEPT 4.3L 6.6L ALLISON TRANSMISSION 6 SPEED A/T AUTOMATIC TRANSMISSION AUTOMATIC TRANSMISSION FLUID PRESSURE (TFP) MANUAL VALVE POSITION SWITCH AUTOMATIC TRANSMISSION INTERNAL MODE SWITCH (IMS) BLK WIRE BODY CONTROL MODULE (BCM) (LOWER LEFT SIDE OF DASH) COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY DATA BUS - ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT) HEAD IGN IGNITION SWITCH LOCK MEGA FUSE ORG/ WIRE ORG/BLK WIRE PARK/ NEUTRAL POSITION (PNP) SWITCH (ON LEFT REAR SIDE OF TRANSMISSION) PARK/NEUTRAL SIGNAL PNK/BLK WIRE POWER DISTRIBUTION SYSTEM POWER SUPPLY PPL RED WIRE RED/BLK WIRE RIGHT BATTERY RUN WIRE STARTER MOTOR STRT RLY CTRL STRTR FUSE 62 (EXCEPT 6.6L) FUSE 57 (6.6L) TAN WIRE TAN/BLK WIRE TRANSMISSION CONTROL MODULE (TCM) TRANSMISSION CONTROL MODULE (TCM) (LEFT FRONT OF ENGINE COMPT, NEAR FAN SHROUD) UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) STRTR RELAY WHT WIRE YEL WIRE YEL/BLK WIRE

AUXILIARY GENERATOR (W/ DUAL GENERATOR) BLK WIRE BRN WIRE CHARGE IND SIG CHARGE INDICATOR COMPUTER DATA LINES SYSTEM DATA BUS - DK GRN WIRE DRIVER INFORMATION CENTER (DIC) ENGINE COMPT) ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF GENERATOR B+ GENERATOR SIG GRY WIRE HOT AT ALL TIMES IGN INSTRUMENT PANEL CLUSTER (IPC) IPC FUSE 43 LOGIC MEGA FUSE POWER DISTRIBUTION SYSTEM RED WIRE RED/WHT WIRE RIGHT BATTERY TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) UNDERHOOD FUSE HOLDER (RIGHT SIDE OF FIREWALL) VOLT W/ DUAL GENERATOR WHT WIRE

AUTOMATIC A/C AUXILIARY GENERATOR BLK WIRE BODY BUILDER EMERGENCY LAMP DK GRN WIRE EMERGENCY VEHICLE PROVISION (BLUNT CUT) FUSE FUSE 34 FUSE FUSE FUSE SUPPLY) (BEHIND RIGHT SIDE OF DASH) FUSIBLE LINK 1 (14 GA- GENERATOR GLOW PLUG CONTROL MODULE (GPCM) HDLP HVAC LTR BATT WASH FUSE 50 FUSE 20 FUSE 36 HEATED SEAT CONTROL MODULE (IF EQUIPPED) HVAC CONTROL MODULE (ON RIGHT FRONT CORNER OF HVAC MODULE) I/P 1 ACCESSORY POWER OUTLET DATA LINK CONNECTOR (DLC) MANUAL A/C INSTRUMENT PANEL CLUSTER (IPC) INTAKE AIR HEATER (IAH) IPC TCM-BATT ECM- FUSE 43 BATT FUSE 7 FUSE 11 ITBC FUSE 19 WSW/HTR FUSE 61 LEFT BATTERY LEFT I/P J/B (LOWER LEFT SIDE OF DASH) LT BLU WIRE LT GRN WIRE MEGA FUSE MOBILE RADIO FUSE BLOCK POWER SUPPLY RED WIRE RED/BLK WIRE RED/WHT WIRE RELAY A RELAY B RIGHT BATTERY RIGHT I/P J/B (IN RIGHT END OF DASH) STARTER MOTOR STUD 2 FUSE 58 SUPPLY TO LEFT I/P J/B (DIAGRAM 4 OF 5) TO ROOF BEACON SWITCH (DIAGRAM 2 OF 5) TO STUD 1 FUSE 63 (DIAGRAM 2 OF 5) TRAILER PROVISION (BLUNT CUT) TRANSFER TRANSFER CASE SHIFT CASE CONTROL ENCODER MODULE MOTOR TREC FUSE 62 UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) UNDERHOOD FUSE HOLDER MEGA (RIGHT SIDE FUSE OF FIREWALL) W/ ACTIVE 2 SPEED W/ DUAL GENERATOR, AMBULANCE UPFITTER SALES PACKAGE W/ ELECTRONIC 2 SPEED, ACTIVE 2 SPEED W/ EMERGENCY VEHICLE ROOF LAMP RELAY W/ WRECKER EMERGENCY LAMP PROVISIONS W/ WRECKER RELAY WHT WIRE WRECKER RELAY YEL WIRE

2 MODE HYBRID 6 SPEED A/T 4.3L EXCEPT 4.3L 6.6L ALLISON TRANSMISSION 6 SPEED A/T AUTOMATIC TRANSMISSION AUTOMATIC TRANSMISSION FLUID PRESSURE (TFP) MANUAL VALVE POSITION SWITCH AUTOMATIC TRANSMISSION INTERNAL MODE SWITCH (IMS) BLK WIRE BODY CONTROL MODULE (BCM) (LOWER LEFT SIDE OF DASH) COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY DATA BUS - ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT) HEAD IGN IGNITION SWITCH LOCK MEGA FUSE ORG/ WIRE ORG/BLK WIRE PARK/ NEUTRAL POSITION (PNP) SWITCH (ON LEFT REAR SIDE OF TRANSMISSION) PARK/NEUTRAL SIGNAL PNK/BLK WIRE POWER DISTRIBUTION SYSTEM POWER SUPPLY PPL RED WIRE RED/BLK WIRE RIGHT BATTERY RUN WIRE STARTER MOTOR STRT RLY CTRL STRTR FUSE 62 (EXCEPT 6.6L) FUSE 57 (6.6L) TAN WIRE TAN/BLK WIRE TRANSMISSION CONTROL MODULE (TCM) TRANSMISSION CONTROL MODULE (TCM) (LEFT FRONT OF ENGINE COMPT, NEAR FAN SHROUD) UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) STRTR RELAY WHT WIRE YEL WIRE YEL/BLK WIRE

4 SPEED 6 SPEED A/T A/T 6.0L (VIN 5) AUTOMATIC A/C AUTOMATIC TRANSMISSION AUXILIARY BATTERY AUXILIARY BATTERY RELAY (IF EQUIPPED) (REAR OF ENGINE COMPT) BLK WIRE BODY BUILDER EMERGENCY LAMP DK GRN WIRE ECM- TCM-BATT HDLP BATT WASH FUSE 14 FUSE 12 FUSE 22 ELECTRONIC, ACTIVE 2 SPEED ACTIVE 2 SPEED 6.0L (VIN K) EMERGENCY LAMP PROVISIONS EMERGENCY VEHICLE PROVISION (BLUNT CUT) EXCEPT 6.0L (VIN 5) FUSE FUSE FUSE FUSE HOLDER (RIGHT SIDE FUSIBLE LINK 1 (14 GA- FUSIBLE LINK 2 (14 GA- FUSIBLE LINK 3 GENERATOR HVAC BATT FUSE 39 I/P 1 ACCESSORY POWER OUTLET DATA LINK CONNECTOR (DLC) INSTRUMENT BODY CONTROL PANEL MODULE CLUSTER (IPC) (BCM) IPC FUSE 46 ITBC FUSE 6 TREC FUSE 67 FUSE 37 LEFT BATTERY LEFT I/P J/B (LOWER LEFT SIDE OF DASH) LT BLU WIRE LT GRN WIRE LTR STUD 2 FUSE 53 FUSE 63 MANUAL A/C MEGA FUSE MEGA FUSE (RIGHT REAR OF ENGINE COMPT) MEGA MEGA OF FIREWALL) FUSE FUSE MOBILE RADIO FUSE BLOCK FUSE (BEHIND RIGHT SIDE OF DASH) MODULE NCA WIRE ORG/ WIRE POWER SUPPLY POWER SUPPLY, AUXILIARY BATTERY RED WIRE RED/ WHT WIRE RED/BLK WIRE RED/WHT WIRE RELAY RELAY A RELAY B RIGHT BATTERY RIGHT I/P J/B (IN RIGHT END OF DASH) RUN WIRE STARTER MOTOR TO AUXILIARY FUSE BLOCK (DIAGRAM 7 OF 7) TO LEFT I/P J/B (DIAGRAM 4 OF 7) TO ROOF BEACON SWITCH (DIAGRAM 2 OF 7) TO STUD 1 FUSE 68 (DIAGRAM 2 OF 7) TO UNDERHOOD FUSE BLOCK (DIAGRAM 2 OF 7) TO UNDERHOOD FUSE BLOCK (DIAGRAM 3 OF 7) TO UNDERHOOD FUSE BLOCK (DIAGRAM 6 OF 7) TRAILER PROVISION (BLUNT CUT) UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) W/ AUXILIARY BATTERY W/ EMERGENCY VEHICLE ROOF LAMP RELAY W/ WRECKER W/ WRECKER RELAY (4.3L) (TOP LEFT REAR OF ENGINE) WHT RED/ WIRE WHT WIRE WRECKER RELAY WSW/HTR FUSE 66 YEL WIRE

A/C COMPRESSOR ACCESSORY DC POWER CONTROL MODULE ACCM FUSE 3 ACPO FUSE 1 AUTOMATIC TRANSMISSION AUXILIARY FLUID PUMP CONTROL MODULE BECM FAN FUSE 2 BECM FUSE 10 CAB HTR PUMP RELAY COOL PUMP RELAY DK BLU WIRE DRIVE MOTOR GENERATOR BATTERY CONTROL MODULE DRIVE MOTOR GENERATOR POWER INVERTER MODULE ELECTRONIC POWER STEERING MOTOR CONTROL MODULE EPS FUSE 7 FAN 1 FUSE FAN CNTRL RELAY FAN HI RELAY FAN MID 2 RELAY FAN MID FAN LO RELAY 1 RELAY FAN-2 FUSE FROM ENG FUSE 4 (DIAGRAM 6 OF 7) FROM RIGHT BATTERY (DIAGRAM 1 OF 7) FROM UNDERHOOD FUSE BLOCK (DIAGRAM 6 OF 7) FUEL FUEL FUEL INJECTOR INJECTOR INJECTOR GENERATOR BATTERY VENT FAN RELAY DRIVE MOTOR GENERATOR BATTERY IGNITION COIL 6 IGNITION FUEL INJECTOR COIL 8 IGNITION IGNITION COIL 4 COIL 2 INJ-B FUSE 13 (EXCEPT 4.3L) MEGA FUSE NCA WIRE PIM 1 FUSE 8 PIM 2 FUSE 9 PNK WIRE PNK/WHT WIRE PPL RED WIRE RED/BLK WIRE RED/WHT WIRE SERIAL DATA GATEWAY (SDG) MODULE TRANS PUMP FUSE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT RED/ WIRE WHT WIRE

4.3L EXCEPT 4.3L 6.6L 6 SPEED A/T ALLISON TRANSMISSION 6 SPEED A/T AUTOMATIC TRANSMISSION AUTOMATIC TRANSMISSION FLUID PRESSURE (TFP) MANUAL VALVE POSITION SWITCH AUTOMATIC TRANSMISSION INTERNAL MODE SWITCH (IMS) BATTERY BLK WIRE BODY CONTROL MODULE (BCM) (LOWER LEFT SIDE OF DASH) COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY DATA BUS - ENGINE CONTROL MODULE (ECM) (EXCEPT HYBRID: LEFT FRONT OF ENGINE COMPT, NEAR FAN SHROUD) (HYBRID: LEFT FRONT OF ENGINE COMPT) HEAD IGN IGNITION SWITCH LOCK MEGA FUSE ORG/ WIRE ORG/BLK WIRE PARK/ NEUTRAL POSITION (PNP) SWITCH (ON LEFT REAR SIDE OF TRANSMISSION) PARK/NEUTRAL SIGNAL PNK WIRE POWER DISTRIBUTION SYSTEM POWER SUPPLY PPL RED WIRE RUN WIRE STARTER MOTOR STRT RLY CTRL STRTR FUSE 62 (EXCEPT 6.6L) FUSE 57 (6.6L) TAN WIRE TAN/BLK WIRE TRANSMISSION CONTROL MODULE (TCM) TRANSMISSION CONTROL MODULE (TCM) (LEFT FRONT OF ENGINE COMPT, NEAR FAN SHROUD) UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) STRTR RELAY WHT WIRE YEL WIRE YEL/BLK WIRE

1 2 PNK WIRE 22 23 24 25 PPL AXLE SW SIG BLK WIRE BRN WIRE BRN/WHT WIRE CAMSHAFT POSITION (CMP) SENSOR (FRONT OF ENGINE, ABOVE CRANK PULLEY) CKP SENSOR SIG CRANKSHAFT POSITION (CKP) SENSOR (FRONT OF ENGINE, RIGHT OF CRANK PULLEY) DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE EGT SENSOR SIG ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT, NEAR FAN SHROUD) FRP SENSOR SIG GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT AT ALL TIMES UNDERHOOD FUSE HOLDER (RIGHT SIDE OF FIREWALL) IGN 1 VOLT INJ 1 INJ 2 INTAKE AIR VALVE LOW REF LT BLU WIRE LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN/BLK WIRE MEGA FUSE NCA WIRE ORG/ WIRE ORG/BLK WIRE PNK 8 9 10 WIRE PNK PNK WIRE PNK WIRE PNK/BLK WIRE POWER DISTRIBUTION SYSTEM PPL PPL/WHT WIRE PTO ENG OFF SIG RED WIRE RED/BLK WIRE RED/WHT WIRE SENS 2 SPLY VOL SIG TAN WIRE TAN/WHT WIRE TCC BRAKE SIG TP SENSOR SIG TRANSMISSIONS SYSTEM WATER IN FUEL WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE