This article provides the fuse box diagrams for the 2008-2009 Ford F-250, F-350, F-450, and F-550.
Whether you need to check, replace, or troubleshoot fuses, these diagrams will help you identify each fuse and relay quickly. Below, you will find the detailed fuse box diagrams and layouts for each model.
Table of Contents
2008 Ford F-250/F-350/F-450/F-550 Fuse Box Diagram
There are two fuse box layouts for the 2008 Ford F-250/F-350/F-450/F-550 including the Power Distribution Box and Passenger Compartment Fuse Panel.
Power Distribution Box
| Fuse/Relay Location | Fuse Amp Rating | Power Distribution Box Description |
| 1 | Relay | Blower motor/Variable blower control (Dual Zone Climate Control) |
| 2 | Relay | Electronic Shift-on-the-Fly (ESOF)Lo-Hi |
| 3 | Relay | Heater mirror |
| 4 | — | Not used |
| 5 | 30A* | Trailer Brake Controller (TBC) |
| 6 | 40A* | ABS module (Pump) |
| 7 | 30A* | Upfitter auxiliary switch #1 |
| 8 | 30A* | Upfitter auxiliary switch #2 |
| 9 | 40A* | ABS module (Coil) |
| 10 | 20A* | Cigar lighter |
| 11 | 20A* | Instrument panel power point |
| 12 | 15A** | Brake On/Off (BOO) relay feed |
| 13 | 5A ** | Brake switch, Brake switch relay coil, SJB module, 4×4 module |
| 14 | — | Not used |
| 15 | — | Not used |
| 16 | Relay | A/C clutch |
| 17 | Relay | Not used |
| 18 | Relay | Fuel Pump Driver Module (FPDM), Fuel injectors (Gasoline engines), Diesel Fuel Control Module (DFCM)(Diesel engine) |
| 19 | Relay | Back-up lamps, Reverse Sensing System (RSS), Engine compartment fuse 63 |
| 20 | Relay | Trailer stop/turn (Left) |
| 21 | Relay | Trailer stop/turn (Right) |
| 22 | Relay | Stop lamps, Center High-Mounted Stop Lamp (CHMSL), TBC, Customer access |
| 23 | 15A** | Heater mirror |
| 24 | 40A* | Blower motor relay |
| 25 | — | Not used |
| 26 | 30A* | ESOF relay lo-hi |
| 27 | 50A* | Glow Plug Control Module (GPCM)#1 (Diesel engine only) |
| 28 | 20A* | Heated mirror relay |
| 29 | 30A* | Passenger power seat |
| 30 | 10A** | A/C clutch relay |
| 31 | 15A** | Power fold mirror relay |
| 32 | 20A** | Fuel pump relay |
| 33 | 20A** | Back-up lamp relay |
| 34 | 25A** | Trailer stop/turn relay |
| 35 | 5A** | ESOF relay coils |
| 36 | 10A** | Gasoline engines: Powertrain Control Module (PCM) keep alive power, Canister ventDiesel engine: Engine Control Module (ECM) keep alive power |
| 37 | 10A** | Transmission Control Module (TCM)(Diesel engine only) |
| 38 | — | Not used |
| 39 | 50A* | ECM power (Diesel engine) |
| 40 | 30A* | Starter relay |
| 41 | 20A* | Power point (Center console -Front) |
| 42 | 30A* | Trailer park lamp relay |
| 43 | 20A* | Power point (Center console – Rear) |
| 44 | 30A* | Trailer battery charge relay |
| 45 | 30A* | Driver power seat or Memory module |
| 46 | 40A* | Run/Start relay |
| 47 | 50A* | GPCM #2 (Diesel engine only) |
| 48 | 30A* | ESOF relay hi-lo |
| 49 | 30A* | Wiper motor |
| 50 | 30A* | PCM relay coil, PCM relay (Gasoline engines only) |
| 51 | — | Not used |
| 52 | — | Not used |
| 53 | Relay | PCM power bus (Fuses 68, 70, 72,74, 76) (Diesel engine only) |
| 54 | Relay | Starter solenoid |
| 55 | Relay | Trailer tow park lamps |
| 56 | Relay | Trailer tow battery charge |
| 57 | Relay | Power Distribution Box (PDB) bus(fuses 67, 69, 71, 73, 75, 77)SJB Run /Start bus (Fuses 29–37,46) |
| 58 | Relay | ESOF hi-lo |
| 59 | Relay | PCM power bus (Fuses 68, 70, 72,74, 76) (Gasoline engines only) |
| 60 | Diode | Starter relay (Gasoline engines only) |
| 61 | Diode | A/C clutch |
| 62 | Diode | Fuel pump |
| 63 | 15A** | Trailer tow back-up lamps |
| 64 | 5A** | Mirror marker lamps |
| 65 | — | Not used |
| 66 | — | Not used |
| 67 | — | Not used |
| 68 | — | Not used |
| 69 | — | Not used |
| 70 | 10A** | Gasoline engines: A/C clutch relay coil, Refrigerant Containment Switch, Heated PCVDiesel engine: A/C clutch relay coil, Clutch switch, Fuel pump cooler, A/C cycle pressure switch |
| 71 | 5A** | Fuel pump relay diode, PCM/ECMRun/Start power |
| 72 | 15A** | Gasoline engines: Ignition coilsDiesel engine: Engine TCM |
| 73 | 2A** | Reverse Camera System (RCS) |
| 74 | 20A** | Gasoline engines: VPWR: HEGO, CMS, MAFS, EVMV, CMCV, VCT, IMTVDiesel engine: VPWR: Engine loads |
| 75 | 5A** | Back-up relay coil power |
| 76 | 20A** | Gasoline engines: VPWR: PCMDiesel engine: VPWR: ECM |
| 77 | 10A** | ABS module logic |
| * Cartridge fuses ** Mini fuses | ||
Passenger Compartment Fuse Panel
| Fuse/Relay Location | Fuse Amp Rating | Passenger Compartment Fuse Panel Description |
| 1 | 30A | Not used (spare) |
| 2 | 15A | Not used (spare) |
| 3 | 15A | Family Entertainment System (FES) |
| 4 | 30A | Not used (spare) |
| 5 | 10A | Keypad illumination, Brake-Shift Interlock (BSI), SPBJB |
| 6 | 20A | Turn signals |
| 7 | 10A | Left headlamp (Low beam) |
| 8 | 10A | Right headlamp (Low beam) |
| 9 | 15A | Interior lighting, Lighted running boards |
| 10 | 15A | Cargo lamp |
| 11 | 10A | Not used |
| 12 | 7.5A | Power mirror switch, Driver power seat (Memory) |
| 13 | 5A | Not used (spare) |
| 14 | 10A | Upfitter relay #3 feed |
| 15 | 10A | Climate control head |
| 16 | 15A | Upfitter Relay #4 Feed |
| 17 | 20A | All lock motor feeds |
| 18 | 20A | Heated seat relay feed |
| 19 | 25A | Not used (spare) |
| 20 | 15A | Adjustable pedals, Datalink |
| 21 | 15A | Fog lamp relay feed, Cornering lamps |
| 22 | 15A | Park lamp relay feed |
| 23 | 15A | High beam headlight relay feed |
| 24 | 20A | Horn relay feed |
| 25 | 10A | Power telescoping mirror switch Demand lamps – underhood and illuminated visor (battery saver) |
| 26 | 10A | Cluster |
| 27 | 20A | Ignition switch feed, Passenger compartment fuses 28, 42, 43, 44, and 45, Engine compartment starter relay coil #57 (Diesel engine), Accessory shutoff control module (if equipped) (Diesel engine), Engine compartment starter relay diode(gasoline engines) |
| 28 | 5A | Radio |
| 29 | 5A | Not used (spare) |
| 30 | 5A | Not used (spare) |
| 31 | 10A | Compass |
| 32 | 10A | Restraints Control Module (RCM), Passenger Airbag Deactivation Indicator |
| 33 | 10A | Trailer tow brake controller, Trailer tow battery charge relay coil |
| 34 | 5A | Not used (spare) |
| 35 | 10A | Reverse Sensing System (RSS), 4×4 module, 4×4 solenoid, Traction control switch, Tow/Haul switch(Diesel engine) |
| 36 | 5A | Passive Anti-Theft System (PATS) transceiver, Cluster control |
| 37 | 10A | Dual automatic or Manual climate control, PTC control |
| 38 | 20A | Subwoofer |
| 39 | 20A | Radio |
| 40 | 20A | 4×4 module, Satellite radio module |
| 41 | 15A | Radio, Electrochromatic rear view mirror, Lock switch illumination |
| 42 | 10A | Heated seat relay coil, Upfitter switch relay coils, Heated mirror relay coil |
| 43 | 10A | Fuel tank selector switch, 4×4 module |
| 44 | 10A | Run/Start customer access feed(PTO) |
| 45 | 5A | Front wiper logic, Blower motor relay coil |
| 46 | 7.5A | E/C mirror |
| 47 | 30A Circuit Breaker | Power windows, Moonroof, Power Sliding Backlite |
| 48 | Relay | Delayed accessory |
2009 Ford F-250/F-350/F-450/F-550 Fuse Box Diagram
The 2009 Ford F-250, F-350, F-450, and F-550 feature two fuse box layouts: the Power Distribution Box and the Passenger Compartment Fuse Panel.
Power Distribution Box
| Fuse/RelayLocation | Fuse AmpRating | Protected Circuits |
| 1 | Relay | Blower motor/Variable blower control(Dual Zone Climate Control) |
| 2 | Relay | Electronic Shift-on-the-Fly (ESOF)Lo-Hi |
| 3 | Relay | Heater mirror |
| 4 | — | Not used |
| 5 | 30A* | Trailer Brake Controller (TBC) |
| 6 | 40A* | ABS module (Pump) |
| 7 | 30A* | Upfitter auxiliary switch #1 |
| 8 | 30A* | Upfitter auxiliary switch #2 |
| 9 | 40A* | ABS module (Coil) |
| 10 | 20A* | Cigar lighter |
| 11 | 20A* | Instrument panel power point |
| 12 | 15A** | Brake On/Off (BOO) relay feed |
| 13 | 5A** | Brake switch, Brake switch relay coil, SJB module, 4×4 module |
| 14 | — | Not used |
| 15 | — | Not used |
| 16 | Relay | A/C clutch |
| 17 | Relay | Wipers |
| 18 | Relay | Fuel Pump Driver Module (FPDM), Fuel injectors (Gasoline engines), Diesel Fuel Control Module (DFCM)(Diesel engine) |
| 19 | Relay | Back-up lamps, Reverse Sensing System (RSS), Engine compartment fuse 63 |
| 20 | Relay | Trailer stop/turn (Left) |
| 21 | Relay | Trailer stop/turn (Right) |
| 22 | Relay | Stop lamps, Center High-Mounted Stop Lamp (CHMSL), TBC, Customer access |
| 23 | 15A** | Heater mirror, Heated spotted mirror |
| 24 | 40A* | Blower motor relay |
| 25 | — | Not used |
| 26 | 30A* | ESOF relay lo-hi |
| 27 | 50A* | Glow Plug Control Module (GPCM) #1(Diesel engine only) |
| 28 | 20A* | Heated mirror relay |
| 29 | 30A* | Passenger power seat |
| 30 | 10A** | A/C clutch relay |
| 31 | 15A** | Power fold mirror relay |
| 32 | 20A** | Fuel pump relay |
| 33 | 20A** | Back-up lamp relay |
| 34 | 25A** | Trailer stop/turn relay |
| 35 | 5A** | ESOF relay coils |
| 36 | 10A** | Gasoline engines: Powertrain Control Module (PCM) keep alive power, Canister ventDiesel engine: Engine Control Module (ECM) keep alive power |
| 37 | 10A** | Transmission Control Module (TCM)(Diesel engine only) |
| 38 | — | Not used |
| 39 | 50A* | ECM power (Diesel engine) |
| 40 | 30A* | Starter relay |
| 41 | 20A* | Power point (Center console – Front) |
| 42 | 30A* | Trailer park lamp relay |
| 43 | 20A* | Power point (Center console – Rear) |
| 44 | 30A* | Trailer battery charge relay |
| 45 | 30A* | Driver power seat or Memory module |
| 46 | 40A* | Run/Start relay |
| 47 | 50A* | GPCM #2 (Diesel engine only) |
| 48 | 30A* | ESOF relay hi-lo |
| 49 | 30A* | Wiper motor |
| 50 | 30A* | PCM relay coil, PCM relay (Gasoline engines only) |
| 51 | — | Not used |
| 52 | — | Not used |
| 53 | Relay | PCM power bus (Fuses 68, 70, 72, 74,76) (Diesel engine only) |
| 54 | Relay | Starter solenoid |
| 55 | Relay | Trailer tow park lamps |
| 56 | Relay | Trailer tow battery charge |
| 57 | Relay | Power Distribution Box (PDB) bus(fuses 67, 69, 71, 73, 75, 77)SJB Run /Start bus (Fuses 29–37, 46) |
| 58 | Relay | ESOF hi-lo |
| 59 | Relay | PCM power bus (Fuses 68, 70, 72, 74,76) (Gasoline engines only) |
| 60 | Diode | One touch start (OTIS) |
| 61 | Diode | A/C clutch |
| 62 | Diode | Fuel pump |
| 63 | 15A** | Trailer tow back-up lamps |
| 64 | 5A** | Mirror marker lamps |
| 65 | — | Not used |
| 66 | — | Not used |
| 67 | — | Not used |
| 68 | — | Not used |
| 69 | — | Not used |
| 70 | 10A** | Gasoline engines: A/C clutch relay coil, Refrigerant Containment Switch, Heated PCVDiesel engine: A/C clutch relay coil, Clutch switch, Fuel pump cooler, A/C cycle pressure switch |
| 71 | 5A** | Fuel pump relay diode, PCM/ECMRun/Start power |
| 72 | 15A** | Gasoline engines: Ignition coilsDiesel engine: Engine TCM |
| 73 | 2A** | Reverse Camera System (RCS) |
| 74 | 20A** | Gasoline engines: VPWR: HEGO, CMS, MAFS, EVMV, CMCV, VCT, IMTVDiesel engine: VPWR: Engine loads |
| 75 | 5A** | Back-up relay coil power |
| 76 | 20A** | Gasoline engines: VPWR: PCMDiesel engine: VPWR: ECM |
| 77 | 10A** | ABS module logic |
| * Cartridge fuses ** Mini fuses | ||
Passenger Compartment Fuse Panel
| Fuse/RelayLocation | Fuse AmpRating | Protected Circuits |
| 1 | 30A | Not used (spare) |
| 2 | 15A | Not used (spare) |
| 3 | 15A | Family Entertainment System (FES) |
| 4 | 30A | Not used (spare) |
| 5 | 10A | Keypad illumination, Brake-Shift Interlock (BSI), SPBJB |
| 6 | 20A | Turn signals |
| 7 | 10A | Left headlamp (Low beam) |
| 8 | 10A | Right headlamp (Low beam) |
| 9 | 15A | Interior lighting, Lighted running boards |
| 10 | 15A | Cargo lamp, Puddle lamp, Switch backlight |
| 11 | 10A | Not used (spare) |
| 12 | 7.5A | Power mirror switch, Driver power seat(Memory) |
| 13 | 5A | Not used (spare) |
| 14 | 10A | Upfitter relay #3 feed |
| 15 | 10A | Climate control head |
| 16 | 15A | Upfitter Relay #4 Feed |
| 17 | 20A | All lock motor feeds |
| 18 | 20A | Heated seat relay feed |
| 19 | 25A | Not used (spare) |
| 20 | 15A | Adjustable pedals, Datalink |
| 21 | 15A | Fog lamp relay feed, Cornering lamps |
| 22 | 15A | Park lamp relay feed |
| 23 | 15A | High beam headlight relay feed |
| 24 | 20A | Horn relay feed |
| 25 | 10A | Power telescoping mirror switch Demand lamps – underhood and illuminated visor(battery saver) |
| 26 | 10A | Cluster |
| 27 | 20A | Ignition switch feed, Passenger compartment fuses 28, 42, 43, 44, and 45, Engine compartment starter relay coil #57 (Diesel engine), Accessory shutoff control module (if equipped) (Diesel engine), Engine compartment starter relay diode (gasoline engines) |
| 28 | 5A | Radio |
| 29 | 5A | Not used (spare) |
| 30 | 5A | Not used (spare) |
| 31 | 10A | Not used (spare) |
| 32 | 10A | Restraints Control Module (RCM), Passenger Airbag Deactivation Indicator |
| 33 | 10A | Trailer tow brake controller, Trailer tow battery charge relay coil |
| 34 | 5A | Not used (spare) |
| 35 | 10A | Reverse Sensing System (RSS), 4×4 module, 4×4 solenoid, Traction control switch, Tow/Haul switch (Diesel engine) |
| 36 | 5A | Passive Anti-Theft System (PATS) transceiver, Cluster control |
| 37 | 10A | Dual automatic or Manual climate control, PTC control |
| 38 | 20A | Subwoofer |
| 39 | 20A | Radio, Navigation radio and amplifier |
| 40 | 20A | 4×4 module, Satellite radio module, SYNC |
| 41 | 15A | Radio, Electrochromatic rear-view mirror, Lock switch illumination |
| 42 | 10A | Heated seat relay coil, Upfitter switch relay coils, Heated mirror relay coil |
| 43 | 10A | Fuel tank selector switch, 4×4 module |
| 44 | 10A | Run customer access feed (PTO) |
| 45 | 5A | Front wiper logic, Blower motor relay coil |
| 46 | 7.5A | Not used (spare) |
| 47 | 30A Circuit Breaker | Power windows, Moon roof, Power Sliding Backlite |
| 48 | Relay | Delayed accessory |
Tip: Some high-amperage fuses may look slightly different depending on the model year and trim. Always verify the fuse type before replacing.
Fuse Replacement Tips / Safety Precautions
- Always disconnect the negative battery terminal before removing fuses.
- Never replace a blown fuse with a higher amp rating — this can damage wiring or cause a fire.
- Use a fuse puller or needle-nose pliers for safety.
- Label replaced fuses for future reference.
Frequently Asked Questions (FAQs)
Why does the cigarette lighter (power socket) fuse keep blowing?
This usually happens when the circuit is overloaded, there’s a short in the wiring, or the wrong fuse is installed. Using high-power devices, damaged wires, or faulty adapters can trigger the fuse to blow. Installing a fuse with lower amperage than Ford recommends can also cause repeated failures.
Why does the radio fuse keep blowing?
Radio fuse problems are often caused by shorted or damaged wires, additional accessories, a faulty radio, or voltage fluctuations. Using a fuse with the wrong amperage can make it blow more easily.
Why does the fog light fuse keep blowing?
Fog light fuses commonly fail due to damaged wiring, a faulty bulb, a defective switch, or modifications that add extra load to the circuit.
Why does the tail light fuse keep blowing?
Tail light fuse issues are usually linked to shorted or damaged wires, bad or incompatible bulbs, a malfunctioning switch, or a fuse with the wrong amperage.
