Fuses and relays GMC T-Series (T6500, T7500, T8500) (2003-2010)

Fuse Layout GMC T6500, T7500, T8500 2003-2010

Fuses and relays GMC T-Series (T6500, T7500, T8500) (2003-2010)

Fuse box location

Instrument Panel Fuse Block

It is located on the top of the instrument panel on the passenger’s side of the vehicle.
Fuses and relays GMC T-Series (T6500, T7500, T8500) (2003-2010)

Fuses and relays GMC T-Series (T6500, T7500, T8500) (2003-2010)

Maxi-Fuse Block

The maxi-fuse block outside of the cab on the driver’s side of the vehicle.

Relay Blocks

There are four relay blocks in your vehicle

Fuse box diagrams

Instrument Panel

Fuses and relays GMC T-Series (T6500, T7500, T8500) (2003-2010)

Assignment of the fuses in the Instrument Panel fuse box

Circuits Protected
1 Ignition Switch
2 Cigarette Lighter
3 ECM Ignition 1
4 Truck Body Controller
5 ALDL Connector
6 Warning Lamp, Ignition Relay, Blower Motor, Motor Relay, Auxiliary Relay, Power Window Relay, INT Relay
7 Room Lamp, Horn, Electric Parking Brake, Radio Back Up, Rear Body Dome Lamp
8 Power Window
9 Exhaust Brake Back Up, Air Suspension Dump, Differential Lock, Air Dryer, Moisture Ejection Heater, Electric Air Compressor, Power Take Off
10 ECM Ignition Power
11 Trailer Turn (LH) Lamp
12 Auxiliary (Ignition ON)
13 Auxiliary (Battery Direct)
14 Headlamp (LH)
15 Headlamp (RH)
16 Headlamp
17 Heated Fuel
18 Meter Truck Body Controller
19 ID Lamp, Marker Lamp, Tail Lamp, Lighted Mirror, Illumination Lamp
20 Cool Condenser Fan Motor, Cooler Compressor
21 Wiper Motor, Washer Motor
22 Heated Mirror, Two-Speed Axle Relay
23 Empty
24 Blower Motor, Air Conditioner Relay
25 Trailer Turn (RH) Lamp, Flasher Unit
26 Power Post (Consent)

Assignment of the fuses in the Maxi-Fuse Block

Name Circuits/Circuit Breakers Protected
ST/TURN/HAZ Stoplamp, Turn Signals/Hazard Warning Flashers
IGN SW3 Air Conditioner, Axle, Chassis
INT/EXT LIGHTS Parldng Lamps, Dome Lamp, Instrument Panel Lights
HEAD LAMP Headlamps, Daytime Running Lamps
AUX WRG Auxiliary, Parking Brake
IGN SW1 Ignition Switch, Washer/Wiper, Crank, Radio
HYD PUMP Hydraulic Brake, Brake Pump Motor
ABS Anti-Lock Brake System Module
ELECT TRANS Ignition Relay
PARK BRAKE Parking Brake Motor
BLOWER HORN Blower, Horn, Cigarette Lighter, Auxiliary
TRAILER ABS Trailer Anti-Lock Brake System, Trailer Stoplamps
PWR WDO/LOCKS Power Windows, Power Door Locks

Relay Block A

Fuses and relays GMC T-Series (T6500, T7500, T8500) (2003-2010)

Relay Block A Usage
1 Power Window
2 Back Lamp (Reverse)
3 High Beam
4 Lighting
5 Lighting (Low, High)
6 Trailer Turn Signal (Left Headlamp)
7 Tail Lamp
8 Marker Lamp
9 Trailer Turn Signal (Right Headlamp)

Relay Block B

Fuses and relays GMC T-Series (T6500, T7500, T8500) (2003-2010)

Relay Block B Usage
1 Air Conditioning Condenser (If Equipped)
2 Air Conditioning Compressor (If Equipped)
3 Heater Fan
4 Ignition (Accessory)
5 Ignition 1
6 Ignition 2
7 Auxiliary
8 Horn
9 Ignition 3
10 Dome Lamp (If Equipped)
11 Exhaust Brake (If Equipped)
12 Power Take Off Control (If Equipped)

Relay Block C

Fuses and relays GMC T-Series (T6500, T7500, T8500) (2003-2010)

Relay Block C Usage
1 Parking Brake
2 Daytime Running Lamps (DRL) On (Engine Run)
3 Daytime Running Lamps (DRL) Off (Parking)
4 Parking Lamps/Daytime Running Lamps (DRL)
5 Fuel Filter (Heated Fuel)
6 Stop Lamp

Relay Block D

Fuses and relays GMC T-Series (T6500, T7500, T8500) (2003-2010)

Relay Block D Usage
1 Neutral (Medium Duty Transmission)
2 Back-up Lamp (Reverse) (Medium Duty Transmission)

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