We’ll comprehensively examine the 2004 Ford F550 fuse box diagram, covering its location, layout, and the functions of each fuse and relay.
By the end of this read, you’ll have the knowledge and confidence to handle electrical problems and ensure optimal performance for your beloved F550.
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 |
Passenger Compartment Fuse Panel/Power Distribution Box
The fuse panel is positioned below and to the left of the steering wheel, near the brake pedal on your 2004 F550. You can access the fuses by removing the cover of the panel.
To remove the cover, turn the panel fasteners in a counterclockwise direction. The fuse panel is located below and to the left of the steering wheel by the brake pedal.
Remove the panel cover to access the fuses. To remove the fuse panel cover, turn the panel fasteners counterclockwise.
| Fuse/Relay Location | Fuse Amp Rating | Passenger Compartment Fuse Panel Description |
| 1 | 15A* | Adjustable pedals |
| 2 | — | Not used |
| 3 | — | Not used |
| 4 | 20A* | Power point – instrument panel |
| 5 | — | Not used |
| 6 | 20A* | Trailer tow turn/stop relay |
| 7 | 30A* | High beam headlamps/Flash to pass |
| 8 | 15A* | Backup lamps (Diesel engine only) |
| 9 | 20A* | Heated mirrors |
| 10 | 10A* | A/C clutch |
| 11 | 20A* | Radio (main) |
| 12 | 20A* | Cigar lighter / OBD II |
| 13 | 5A* | Power mirrors/switches |
| 14 | 15A* | Daytime running lamps (DRL) |
| 15 | — | Not used |
| 16 | — | Not used |
| 17 | 15A* | Exterior lamps |
| 18 | 20A* | Turn lamps/Brake on-off switch(high) |
| 19 | 10A* | Body security module/4×4 module |
| 20 | 10A* | Fuel Injection Control Module(FICM) relay (Diesel engine only) |
| 21 | — | Not used |
| 22 | 20A* | Engine control |
| 23 | 20A* | Engine control (gasoline engine only), Climate control (Diesel engine only) |
| 24 | 2A* | Brake pressure switch/Speed control |
| 25 | 10A* | 4-Wheel Anti-lock Brake System(4WABS) module, Variable Fan Control (VFC) (Diesel engine only) |
| 26 | 10A* | Air bags |
| 27 | 15A* | Ignition switch Run feed |
| 28 | 10A* | EATC module/Front blower relay coil |
| 29 | 10A* | Customer access |
| 30 | 15A* | Highbeam headlamps |
| 31 | 15A* | Clutch interlock switch (manual transmissions only), Transmission range sensor (automatic transmissions only) then to starter relay coil (all transmissions), 4×4 |
| 32 | 5A* | Radio (start) |
| 33 | 15A* | Front wiper |
| 34 | 10A* | Brake on-off switch |
| 35 | 10A* | Instrument cluster |
| 36 | 10A* | PCM Memory |
| 37 | 15A* | Horn |
| 38 | 20A* | Trailer tow park lamps |
| 39 | 15A* | Trailer tow back-up lamps |
| 40 | 20A* | Fuel pump |
| 41 | 10A* | Instrument cluster |
| 42 | 15A* | Delayed accessory |
| 43 | 10A* | Fog lamps |
| 44 | — | Not used |
| 45 | 10A* | Ignition switch Run/Start feed |
| 46 | 10A* | Left-hand lowbeam |
| 47 | 10A* | Right-hand lowbeam |
| 48 | — | Not used |
| 101 | 30A** | Trailer tow electric brake |
| 102 | 30A** | Door locks/Body security module |
| 103 | 50A** | Ignition switch (gasoline engine only), FICM power (Diesel engine only) |
| 104 | 40A** | Heated backlight |
| 105 | 30A** | Fuel heater (Diesel engine only) |
| 106 | 30A** | Front wiper main |
| 107 | 40A** | Front blower motor |
| 108 | — | Not used |
| 109 | 30A** | Heated seats |
| 110 | 50A** | Ignition switch |
| 111 | 30A** | 4WD/Shift on the fly |
| 112 | 30A** | Left-hand power seats |
| 113 | 30A** | Starter motor |
| 114 | 30A** | Right-hand power seats |
| 115 | 20A** | Trailer tow battery charge |
| 116 | 30A** | Ignition switch |
| 601 | 30A CB*** | Window motors, Moonroof |
| 602 | 60A** | 4WABS module |
| 210 | — | Not used |
| 211 | — | Backup lamps relay (Diesel engine only) |
| 212 | — | Not used |
| 301 | — | Front blower motor relay |
| 302 | — | Powertrain Control Module (PCM) relay |
| 303 | — | Fuel heater relay (Diesel engine only) |
| 304 | — | Heated backlight relay |
| 305 | — | Trailer tow battery charge relay |
| 306 | — | Delayed accessory relay |
| 307 | — | Starter relay |
| * Mini Fuses ** Maxi Fuses ***Circuit Breaker | ||
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.