Engine Compartment Fuse Box
| Number | Ampere rating [A] | Description |
| F1 | 15 | Main light switch |
| F2 | 30 | Power seat (driver) |
| F3 | 30 | Power seat (passenger) |
| F4 | 15 | Washer pump relay, Washer pump motor |
| F5 | 15 | Caterpillar / Cummins: Brake warning switch |
| F6 | 15 | Caterpillar: Air intake heater |
| F7 | 15 | Stoplamp switches, Brake pressure switches, Stoplamp relay |
| F8 | 25 | Caterpillar: Fuel heater relay |
| Power Stroke 6.0L (’04-’07): Fuel heater relay | ||
| F9 | 20 | ’06-’10: Inhibit relay, Engine ECM, Cluster, Transmission TCM, CJB Start (’07), CJB Run (’07), Starter cutoff (’10) |
| F10 | 15 | ’04-’09: Heated drain valve ’10: Air tank moisture removal valve |
| F11 | 30 | ’07-’10: Electronic trailer brake |
| F12 | 20 | ’06-’10: Daytime Running Lamps (DRL), Blend door actuator, Climate mode, Back-up, Heated seats, Trailer ABS, Exhaust brake |
| F13 | 10 | ’04-’05: Parking brake |
| F14 | — | — |
| F15 | 7,5 | ’04-’09: Body builder – trailer adapter stoplamps |
| F16 | 5 | Hydraulic Brake: WABCO ABS Air Brake: Bendix Air ABS |
| F17 | — | — |
| F18 | 10 | Fuel transfer pump |
| F19 | — | — |
| F20 | 10 | Power Stroke 6.0L (’04-’07): Engine ECM power relay |
| F21 | 10 | ’04-’08: Hydromax motor input to GEM |
| F22 | 10 | Power Stroke 6.0L (’04-’07): Engine IDM2 logic power |
| F23 | — | — |
| F24 | — | — |
| F101 | 30 | Air Brake: Bendix Air ABS relay Hydraulic Brake: Hydraulic brakes module |
| F102 | 20 | Ignition switch to customer access |
| F103 | 50 | ’04-’05: Ignition switch, Passenger compartment fuse box fuses 8, 9, 10, 11, 19, 20, 23, 24, 25, 29, 30, 31 |
| 20 | ’06-’10: Ignition switch, Passenger compartment fuse box fuses 8, 9, 10, 11, 19, 29, 30 | |
| F104 | 20 | Power point |
| F105 | 20 | Door lock switches |
| F106 | 30 | Main light switch, Multifunction switch, Passenger compartment fuse box fuses 16, 26 and 28, Headlamps, DRL relays |
| F107 | 50 | Passenger compartment fuse box fuses 1, 2, 3, 4, 12, 13, 14, 15 |
| F108 | 40 | Cummins: Fuel heater relay |
| F109 | 40 | Power window relay |
| F110 | 30 | ’06-’10: Windshield wiper relay |
| F111 | 30 | Park lamps relay, Park lamps, Body builder relay |
| F112 | 40 | Blower motor relay, Blower motor |
| F113 | 30 | Heated seats switches, Air ride seat (’09-’10) |
| F114 | 25 | ’04-’09: Hydraulic Brake: ABS ECU power |
| F115 | 40 | ’04-’05: Ignition switch, Passenger compartment fuse box fuses 5, 8, 9, 10, 11, 21 |
| 20 | ’06-’10: Ignition switch, Passenger compartment fuse box fuses 8, 9, 10 and 11, Starter motor relay (’06-’09) | |
| F116 | 30 | Turn relays and back-up lamp relay |
| F117 | 20 | Stoplamp relay |
| F118 | 60 | Trailer tow left, right and ABS fuse block (Hydraulic brake vehicles) |
| F119 | 60 | Trailer tow fuse block, Stop/Tail/Marker lamps |
| F120 | 60 | Trailer tow fuse block (Air brake vehicles), Left, right and ABS, Hydraulic HydroMax pump motor fuse relay |
| Relay | ||
| 201 | Washer pump relay | |
| 202 | Wiper speed relay | |
| 203 | Wiper run-park relay | |
| 204 | ’04-’06: Power Stroke 6.0L: Neutral start relay Caterpillar / Cummins: Exhaust brake relay ’07-’10: Windshield wiper relay |
|
| 205 | ’04-’09: RH stop/turn relay ’10: Body builder relay, right turn |
|
| 206 | ’04-’09: LH stop/turn relay ’10: Body builder relay, left turn |
|
| 207 | ’04-’06:Drain valve heater relay ’07-’09: Hydraulic Brake: ABS event relay ’10: Air Brake: ABS event relay Hydraulic Brake: Stop lamp relay |
|
| 208 | Back-up lamps relay, body builder relay (’10) | |
| 209 | ’04-’07: V8 engines: ECM ISO relay Caterpillar / Cummins: Stop lamp relay ’08-’09: Stop lamp relay ’10: Auxiliary stoplamp relay |
|
| 301 | Fuel heater/transfer pump relay | |
| 302 | Park lamp relay, body builder relay (’10) | |
| 303 | Blower motor relay | |
| 304 | Air Brake: ABS relay Hydraulic Brake: Hydraulic modulator relay |
|
| Diode | ||
| 501 | — | |
| 502 | — | |
| 503 | — | |
| Resister | ||
| 401 | — | |
Passenger Compartment Fuse Box
| Number | Ampere rating [A] | Description |
| 1 | 20 | Horn relay |
| 2 | 15 | Hazard flasher |
| 3 | 20 | Cigar lighter |
| 4 | 10 | Data Link Connector (DLC), Engine diagnostic connector (’10), Parking brake warning (’07-’10) |
| 5 | 15 | Blend door actuator, Function selector switch assembly (’10), Trailer tow relay (’10), Trailer ABS (’05-’10), Daytime Running Lights (DRL), Climate mode (’07-’10), Heated seats, Exhaust brakes (’07-’10), Back-up lamps switch |
| 6 | 10 | ’04: Horn switch |
| 7 | — | — |
| 8 | 5 | Radio, GEM |
| 9 | 5 | Switch illumination (Headlamp, Power windows, Power door locks (’04-’07)), Power window switch LED and relay |
| 10 | 15 | Heated and lighted mirrors |
| 11 | 30 | ’04-’06:Wiper motor, Washer pump relay |
| 5 | ’07-’10: Wiper and washer systems | |
| 12 | 10 | ’04-’09: Stop lamp switch (Hydraulic brake vehicles), Allison push-button shifter (’08-’09) ’10: Brake pedal position switch, Transmission shift selector, Stoplamp switch, Cruise switches |
| 13 | 20 | Cluster, Radio |
| 14 | 14 | Interior lamp relay |
| 15 | 10 | Interior lamp relay, Vanity mirror lamps, Map lamps, Generic Electronic Module (GEM) |
| 16 | 15 | Headlamp high beam, High beam indicator |
| 17 | — | — |
| 18 | 5 | Headlamp switch interior lighting |
| 19 | 15 | Engine control (all engines), Accelerator pedal (6.0L Power Stroke engine) |
| 20 | 15 | ’04-’06:Starter relay, GEM |
| 5 | ’07-’10: Starting system | |
| 21 | 10 | Daytime Running Lights (DRL) resistor |
| 22 | 15 | Speed control feed (6.0L Power Stroke engine (’04)), Fuel transfer pump (’04), Air horn, Air solenoid 4–pack (Air horn, Air suspension dump, Differential lock axle and Two-speed axle) |
| 23 | 10 | Hazard flasher (Run) |
| 24 | 15 | ABS, Air dryer, Vacuum pump, Fuel heater relay |
| 25 | 10 | Function selector switch |
| 26 | 10 | Right hand low beam headlamp |
| 27 | — | — |
| 28 | 10 | Left hand low beam headlamp |
| 29 | 10 | Cluster (Power, Warning lamps), Gauges GEM, Hydraulic ABS relay, Air traction control, Hourmeter, Transmission temp |
| 30 | 15 | ’07-’10: Allison electronic transmission |
| 31 | 15 | ’04-’06:Allison transmission or ABS event |
| Relay | ||
| R1 | Interior lamp relay | |
| R2 | — | |
| R3 | Horn relay | |
| R4 | One-touch window down relay | |
| R5 | — | |
Additional Relay Box No.2
| Number | Ampere rating [A] | Description |
| 1 | 30 | Trailer tow ABS feed |
| 2 | 30 | Trailer tow park/marker lamps |
| 3 | 30 | Trailer tow stop lamps |
| 4 | 30 | Trailer tow turn/stop lamps (combined) Trailer tow turn lamps (separate) |
| 5 | — | — |
| Relay | ||
| R1 | Trailer tow ABS relay | |
| R2 | ’04-’07: Trailer tow stop lamp relay ’08-’10: Trailer tow marker lamp relay |
|
| R3 | ’04-’07: Trailer tow park/marker lamp relay ’08-’10: Trailer tow stop lamp relay |
|
| R4 | Trailer tow tail lamp relay | |
| R5 | — | |
| R6 | — | |
| R7 | ’04-’07: Trailer tow left turn/stop lamp relay (combined) Trailer tow left turn lamp relay (separate) ’08-’10: Trailer tow left turn lamp relay |
|
| R8 | ’04-’07: Trailer tow right turn/stop lamp relay (combined) Trailer tow right turn lamp relay (separate) ’08-’10: Trailer tow right turn lamp relay |
|
Passenger Compartment Relay Box (’10)
The relay center is located on the instrument panel behind the passenger side airbag panel.
| Number | Description |
| R1 | — |
| R2 | Starter cutoff |
| R3 | Run relay |
| R4 | ABS warning indicator |
| R5 | Hydraulic brake buzzer |
| R6 | Eaton UltraShift |
| R7 | Two-speed axle/Differential lock disable |
| R8 | Air tank moisture removal valve |
| R9 | — |
| R10 | Hydraulic brake |
| R11 | Eaton Ultrashift fan |
| R12 | Starter cutoff |
| R13 | Flasher |
| R14 | Power window |
| R15 | Full power buzzer |
| R16 | Warning chime module |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.