2008 Ford F550 Fuse Box Diagram

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.

Standard fuse amperage rating and color

Fuse ratingMini fusesStandard fusesMaxi fusesCartridge maxi fusesFuse link cartridge

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:

  1. Inside the vehicle, pull the hood release handle under the left side of the dashboard.
  2. 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.
  3. Lift the hood until it stays open by itself.
NoFuse Amp. RatingDescription
1RelayBlower motor/Variable blower control (Dual Zone Climate Control)
2RelayElectronic Shift-on-the-Fly (ESOF) Lo-Hi
3RelayHeater mirror
4Not used
530A*Trailer Brake Controller (TBC)
640A*ABS module (Pump)
730A*Upfitter auxiliary switch #1
830A*Upfitter auxiliary switch #2
940A*ABS module (Coil)
1020 A*Cigar lighter
1120 A*Instrument panel power point
1215 A**Brake On/Off (BOO) relay feed
135A **Brake switch, Brake switch relay coil, SJB module, 4×4 module
14Not used
15Not used
16RelayA/C clutch
17RelayNot used
18RelayFuel Pump Driver Module (FPDM), Fuel injectors (Gasoline engines), Diesel Fuel Control Module (DFCM) (Diesel engine)
19RelayBack-up lamps, Reverse Sensing System (RSS), Engine compartment fuse 63
20RelayTrailer stop/turn (Left)
21RelayTrailer stop/turn (Right)
22RelayStop lamps, Center High-Mounted Stop Lamp (CHMSL), TBC, Customer access
2315 A**Heater mirror
2440A*Blower motor relay
25Not used
2630A*ESOF relay lo-hi
2750A*Glow Plug Control Module (GPCM) #1 (Diesel engine only)
2820 A*Heated mirror relay
2930A*Passenger power seat
3010A**A/C clutch relay
3115 A**Power fold mirror relay
3220A**Fuel pump relay
3320A**Back-up lamp relay
3425A**Trailer stop/turn relay
355A**ESOF relay coils
3610A**Gasoline engines: Powertrain Control Module (PCM) keep alive power, Canister vent
Diesel engine: Engine Control Module (ECM) keep alive power
3710A**Transmission Control Module (TCM) (Diesel engine only)
38Not used
3950A*ECM power (Diesel engine)
4030A*Starter relay
4120 A*Power point (Center console – Front)
4230A*Trailer park lamp relay
4320 A*Power point (Center console – Rear)
4430A*Trailer battery charge relay
4530A*Driver power seat or Memory module
4640A*Run/Start relay
4750A*GPCM #2 (Diesel engine only)
4830A*ESOF relay hi-lo
4930A*Wiper motor
5030A*PCM relay coil, PCM relay (Gasoline engines only)
51Not used
52Not used
53RelayPCM power bus (Fuses 68, 70, 72, 74, 76) (Diesel engine only)
54RelayStarter solenoid
55RelayTrailer tow park lamps
56RelayTrailer tow battery charge
57RelayPower Distribution Box (PDB) bus (fuses 67, 69, 71, 73, 75, 77) SJB Run /Start bus (Fuses 29-37, 46)
58RelayESOF hi-lo
59RelayPCM power bus (Fuses 68, 70, 72, 74, 76) (Gasoline engines only)
60DiodeStarter relay (Gasoline engines only)
61DiodeA/C clutch
62DiodeFuel pump
6315 A**Trailer tow back-up lamps
645A**Mirror marker lamps
65Not used
66Not used
67Not used
68Not used
69Not used
7010A**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
715A**Fuel pump relay diode, PCM/ECM Run/Start power
7215 A**Gasoline engines: Ignition coils
Diesel engine: Engine TCM
73Not used
7420A**Gasoline engines: VPWR: HEGO, CMS, MAFS, EVMV, CMCV, VCT, IMTV
Diesel engine: VPWR: Engine loads
755A**Back-up relay coil power
7620A**Gasoline engines: VPWR: PCM
Diesel engine: VPWR: ECM
7710A**ABS module logic
* Cartridge fuses
** Mini fuses

Passenger Compartment Fuse Panel


The Passenger Compartment Fuse panel is located in the passenger’s footwell.

  1. Locate the fuse panel in the passenger’s footwell. It’s a box that contains the fuses.
  2. 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.
  3. 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.
NoFuse Amp. RatingDescription
130ANot used (spare)
215ANot used (spare)
315AFamily Entertainment System (FES)
430ANot used (spare)
510AKeypad illumination, Brake-Shift Interlock (BSI)
620ATurn signals
710ALeft headlamp (Low beam)
810ARight headlamp (Low beam)
915AInterior lighting
1015ACargo lamp
1110ANot used
127.5APower mirror switch, Driver power seat (Memory)
137.5ANot used (spare)
1410AUpfitter relay #3 feed
1510AClimate control head
1615AUpfitter Relay #4 Feed
1720AAll lock motor feeds
1820AHeated seat relay feed
1925ANot used (spare)
2015AAdjustable pedals, Datalink
2115AFog lamp relay feed, Cornering lamps
2215APark lamp relay feed
2315AHigh beam headlight relay feed
2420AHorn relay feed
2510APower telescoping mirror switch Demand lamps – underhood and illuminated visor (battery saver)
2720AIgnition switch feed, Passenger compartment fuses 28, 43 and 45, Engine compartment starter relay coil #57 (Diesel engine), Engine compartment starter relay diode (gasoline engines)
295ANot used (spare)
305ANot used (spare)
3210ARestraints Control Module (RCM), Passenger Airbag Deactivation Indicator
3310ATrailer tow brake controller, Trailer tow battery charge relay coil
345ANot used (spare)
3510AReverse Sensing System (RSS), 4×4 module, 4×4 solenoid, Traction control switch, Tow/Haul switch (Diesel engine)
365APassive Anti-Theft System (PATS) transceiver, Cluster control
3710ADual automatic or Manual climate control, PTC control
4020A4×4 module, Satellite radio module
4115ARadio, Electrochromatic rear view mirror, Lock switch illumination
4210AHeated seat relay coil, Upfitter switch relay coils, Heated mirror relay coil
4310AFuel tank selector switch, 4×4 module
4410ARun/Start customer access feed (PTO)
455AFront wiper logic, Blower motor relay coil
467.5ANot used (spare)
4730A Circuit BreakerPower windows, Moonroof, Power Sliding Backlite
48RelayDelayed 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.

Leave a comment