Power distribution
The Power distribution box is located behind the cab on the right-hand frame rail, behind a protective cover.
| Number | A | Description |
| 1 | — | — |
| 2 | 30 | Starter |
| 3 | 20 | Park lamps |
| 4 | 50 | 2008-2009: Injector Driver Module (IDM)/Powertrain Control Module (PCM) |
| 40 | 2006-2007: Injector Driver Module (IDM)/Powertrain Control Module (PCM) | |
| 5 | 30 | Headlamps |
| 6 | 40 | Blower motor |
| 7 | 25 | Wipers |
| 8 | 30 | Electric brakes |
| 9 | 20 | Door locks |
| 10 | 20 | Stoplamps |
| 11 | 20 | Fuel pump |
| 12 | 20 | RUN/ACC feed |
| 13 | 20 | RUN/START feed |
| 14 | 15 | Horn |
| 15 | 10 | Cluster |
| 16 | 15 | Back-up lamps |
| 17 | 15 | Fog lamps |
| 18 | 15 | Transmission |
| 19 | 20 | Fuel heater |
| 20 | 60 | Anti-lock Brake System (ABS) module |
| 21 | 20 | Trailer lighting circuit |
| 22 | 30 | 2006-2007: Body builder circuits |
| 23 | 40 | Trailer battery charge |
| 24 | 20 | Cigar lighter |
| 25 | 20 | Hazard flasher |
| 26 | 15 | Remote Keyless Entry (RKE) |
| 27 | 10 | Radio |
| 28 | 10 | Dome lamp |
| 29 | 60 | ABS pump |
| 30 | 30 | HVAC pusher fan |
| 31 | 20 | Diagnostic connector |
| 32 | 40 | Power windows |
| 33 | 25 | Body builder prep |
| 34 | 20 | A/C clutch |
| 35 | 20 | Cluster |
| 36 | — | — |
| 37 | 10 | Turn signals |
| 38 | — | — |
| 39 | 10 | Cornering lamps |
| 40 | 10 | IDM logic power, Fan drive |
| 41 | 10 | PCM power |
| 42 | 10 | Radio |
| 43 | — | — |
| 44 | — | — |
| 45 | — | — |
| 46 | 20 | 2008-2009: PCM key power |
| 5 | 2006-2007: PCM key power | |
| Relay | ||
| 47 | Body builder prep | |
| 48 | Fuel pump | |
| 49 | Back-up lamps | |
| 50 | 2006-2007: PCM | |
| 51 | Fuel heater | |
| 52 | Transmission | |
| 53 | A/C clutch | |
| 54 | Fog lamps | |
| 55 | 2008-2009: ECM 2006-2007: IDM |
|
| 56 | Wiper | |
| 57 | Starter | |
| 58 | — | |
| 59 | Park lamps | |
| 60 | Transmission relay diode | |
| 61 | — | |
Relay Box
The relay box is located under the center of the instrument panel.
2006
| Number | Description |
| R1 | Low beams |
| R2 | High beams |
| R3 | Blower motor |
| R4 | Power windows |
2007-2009
| Relay location | Description |
| A/C DEMAND | Climate control |
| HORN | Horn |
| RT FRONT | Right front turn signal |
| TURN SIGNAL | Turn signals |
| IGN. | Ignition |
| PUSHER FAN | HVAC pusher fan |
| LEFT FRONT | Left front turn signal |
| DOME LAMP | 2008-2009: Dome lamp |
| RT REAR | Right rear turn signal |
| HEADLAMP | Headlamps |
| BLOWER MOTOR | Climate control blower motor |
| LEFT REAR | Left rear turn signal |
| HIGH/LOW | Headlamp high/low beams |
| POWER WINDOWS | Power windows |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.