In this technical blog, we will explore the fuse box diagram for the 2008 Ford F550, decoding its contents and providing valuable insights on how to identify and replace fuses.
Table of Contents
Standard fuse amperage rating and color
| COLOR | |||||
| Fuse rating | Mini fuses | Standard fuses | Maxi fuses | Cartridge maxi fuses | Fuse link cartridge |
| 2A | Grey | Grey | — | — | — |
| 3A | Violet | Violet | — | — | — |
| 4A | Pink | Pink | — | — | — |
| 5A | Tan | Tan | — | — | — |
| 7.5A | Brown | Brown | — | — | — |
| 10A | Red | Red | — | — | — |
| 15A | Blue | Blue | — | — | — |
| 20A | Yellow | Yellow | Yellow | Blue | Blue |
| 25A | Natural | Natural | — | — | — |
| 30A | Green | Green | Green | Pink | Pink |
| 40A | — | — | Orange | Green | Green |
| 50A | — | — | Red | Red | Red |
| 60A | — | — | Blue | — | Yellow |
| 70A | — | — | Tan | — | Brown |
| 80A | — | — | Natural | — | Black |
2008 Ford F550 Fuse Box Diagram (Power Distribution Box)
The engine compartment of your 2008 Ford F550 houses a vital component known as the power distribution box. This box is home to high-current fuses that have a critical role in protecting the primary electrical systems of your vehicle from overloads. By effectively safeguarding against electrical surges, these fuses contribute to the seamless operation of your F550’s electrical functions.
To access the Power Distribution Box, you need to open the hood via the following steps:
- Inside the vehicle, pull the hood release handle under the left side of the dashboard.
- Go to the front of the vehicle and find the latch below the passenger side of the grille, next to the headlight. Slide the handle to release the latch.
- Lift the hood until it stays open by itself.
| No | Fuse Amp. Rating | 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 | 20 A* | Cigar lighter |
| 11 | 20 A* | Instrument panel power point |
| 12 | 15 A** | 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 | 15 A** | 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 | 20 A* | Heated mirror relay |
| 29 | 30A* | Passenger power seat |
| 30 | 10A** | A/C clutch relay |
| 31 | 15 A** | 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 | 20 A* | Power point (Center console – Front) |
| 42 | 30A* | Trailer park lamp relay |
| 43 | 20 A* | 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 | 15 A** | 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 | 15 A** | 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 |
| * Cartridge fuses ** Mini fuses |
Passenger Compartment Fuse Panel
The Passenger Compartment Fuse panel is located in the passenger’s footwell.
- Locate the fuse panel in the passenger’s footwell. It’s a box that contains the fuses.
- Remove the panel cover to access the fuses. Simply pull the panel towards you. The clips holding the panel will disengage, allowing the panel to fall easily.
- To remove a fuse, use the fuse puller tool that is provided on the fuse panel cover. It helps you safely grip and remove the fuse.
| No | Fuse Amp. Rating | 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) |
| 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), 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 | Not used (spare) |
| 47 | 30A Circuit Breaker | Power windows, Moonroof, Power Sliding Backlite |
| 48 | Relay | Delayed accessoiy |
Tom Smith is a passionate car mechanic and automotive enthusiast, specializing in the intricate world of car fuse boxes. With years of hands-on experience under the hood, he has earned a reputation as a reliable expert in his field. As the founder and content creator of the popular blog website 'carsfuse.com,' Tom has dedicated himself to sharing his extensive knowledge of car fuse boxes and electrical systems with the world.