Ford F-550 2008 Fuse Box Info
Passenger compartment fuse box location:
The fuse box is located in the passenger’s footwell.
Engine compartment fuse box location:
Fuse Box Diagram | Layout
Passenger compartment fuse box:
| Fuse/Relay N° | Rating | Functions |
| 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) |
| 6 | 20A | Turn signals |
| 7 | 10A | Left headlamp (Low beam) |
| 8 | 10A | Right headlamp (Low beam) |
| 9 | 15A | Interior lighting |
| 10 | 15A | Cargo lamp |
| 11 | 10A | Not used |
| 12 | 7.5A | Power mirror switch, Driver power seat (Memory) |
| 13 | 7.5A | 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, 43 and 45, Engine compartment starter relay coil #57 (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), 4x4 module, 4x4 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 | 4x4 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, 4x4 module |
| 44 | 10A | Run/Start customer access feed (PTO) |
| 45 | 5A | Front wiper logic, Blower motor relay coil |
| 46 | 7.5A | Not used (spare) |
| 47 | 30A | Power windows, Moonroof, Power Sliding Backlite |
| 48 | - | Delayed accessory |
Engine compartment fuse box:
| Fuse/Relay N° | Rating | Functions |
| 1 | - | Blower motor/Variable blower control (Dual Zone Climate Control) |
| 2 | - | Electronic Shift-on-the-Fly (ESOF) Lo-Hi |
| 3 | - | 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, 4x4 module |
| 14 | - | Not used |
| 15 | - | Not used |
| 16 | - | A/C clutch |
| 17 | - | Not used |
| 18 | - | Fuel Pump Driver Module (FPDM), Fuel injectors (Gasoline engines), Diesel Fuel Control Module (DFCM) (Diesel engine) |
| 19 | - | Back-up lamps, Reverse Sensing System (RSS), Engine compartment fuse 63 |
| 20 | - | Trailer stop/turn (Left) |
| 21 | - | Trailer stop/turn (Right) |
| 22 | - | 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 vent Diesel 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 | - | PCM power bus (Fuses 68, 70, 72, 74, 76) (Diesel engine only) |
| 54 | - | Starter solenoid |
| 55 | - | Trailer tow park lamps |
| 56 | - | Trailer tow battery charge |
| 57 | - | Power Distribution Box (PDB) bus (fuses 67, 69, 71, 73, 75, 77) SJB Run /Start bus (Fuses 29–37, 46) |
| 58 | - | ESOF hi-lo |
| 59 | - | PCM power bus (Fuses 68, 70, 72, 74, 76) (Gasoline engines only) |
| 60 | - | Starter relay (Gasoline engines only) |
| 61 | - | A/C clutch |
| 62 | - | 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 PCV Diesel engine: A/C clutch relay coil, Clutch switch, Fuel pump cooler, A/C cycle pressure switch |
| 71 | 5A | Fuel pump relay diode, PCM/ECM Run/Start power |
| 72 | 15A |
Gasoline engines: Ignition coils Diesel engine: Engine TCM |
| 73 | - | Not used |
| 74 | 20A |
Gasoline engines: VPWR: HEGO, CMS, MAFS, EVMV, CMCV, VCT, IMTV Diesel engine: VPWR: Engine loads |
| 75 | 5A | Back-up relay coil power |
| 76 | 20A |
Gasoline engines: VPWR: PCM Diesel engine: VPWR: ECM |
| 77 | 10A | ABS module logic |
