In this article, we’re going to explore the 2003 Ford F150 fuse box diagram. We’ll explain what each fuse does, making it simpler for you to understand how your vehicle’s electrical system works. Our aim is to give you the knowledge to tackle electrical issues with confidence, like a pro.
Table of Contents
Note: If a fuse blows or a circuit breaker opens, all parts connected to that circuit will stop working. Taking the time to inspect and replace faulty fuses can save you from unnecessary repairs and potential hazards, ensuring the smooth operation of your vehicle's electrical components.
2003 Ford F150 Power Distribution Box Diagram (Underhood)
Note: In the event that you need to disconnect and reconnect the battery, it's important to note that certain features may require resetting. This step is necessary to restore their functionality.
*Mini fuses /**Maxi fuses
| Fuse/RelayLocation | Fuse AmpRating | Power Distribution BoxDescription |
| 1 | 20A * | Powerpoint |
| 2 | 30A* | Powertrain Control Module (PCM) |
| 3 | 30A* | Main light switch, Headlamp relay, Multifunction switch |
| 4 | 20A* | Console power point (Harley-Davidson only) |
| 5 | 20A* | Trailer tow backup/park lamps |
| 6 | 15A* | Main light switch, Park lamp relay |
| 7 | 20A* | Horn |
| 8 | 15A* | Power door locks, Central Security Module (CSM), Lock relays (not used on SuperCrew) |
| 9 | 15A* | Daytime Running Lamps (DRL), Fog lamps |
| 10 | 20A* | Fuel pump |
| 11 | 20A* | Alternator field |
| 12 | 20A* | Rear auxiliary power point(SuperCrew only) |
| 13 | 15A* | A/C clutch |
| 14 | — | Not used |
| 15 | 10A* | Running board lamps |
| 16 | 15A* | Four-wheel Anti-lock Brake System (4WABS) module/Rear-wheel Anti-lock brake System (RABS) module,Ignition switch |
| 17 | — | Not used |
| 18 | 15A* | Bi-fuel injector module, fuel selector switch, and alternative fuel injectors (Bi-fuel vehicles only) |
| 19 | 10A* | Trailer/Camper adapter (right stop/turn lamp) |
| 20 | 10A* | Trailer/Camper adapter (left stop/turn lamp) |
| 21 | — | Not used |
| 22 | — | Not used |
| 23 | 15A* | HEGO sensor, Automatic transmission |
| 24 | — | Not used |
| 101 | 30A** | Trailer tow battery charge |
| 102 | 50/20A** | Four-wheel Anti-lock Brake System (4WABS) module/Rear-wheel Anti-lock brake System (RABS) module, Ignition switch |
| 103 | 50A** | Central junction box |
| 104 | 30A** | 4×4 shift motor & clutch |
| 105 | 40A** | Climate control front blower |
| 106 | 20A** | Intercooler pump (supercharged engine only) |
| 107 | — | Not used |
| 108 | 30A** | Trailer tow electric brake |
| 109 | — | Not used |
| 110 | 30A** | Accessory delay relay (Not used on SuperCrew) |
| 111 | 40A** | Ignition switch battery feed (start and run circuits) |
| 112 | 30A** | Drivers power seat, Adjustable pedal switch |
| 113 | 40A** | Ignition switch battery feed (run and accessory circuits) |
| 114 | — | Not used |
| 115 | 20A** | Power door locks (SuperCrew only) |
| 116 | 40A** | Heated backlight |
| 117 | – | |
| 118 | 30A** | Heated seats |
| 201 | — | Trailer tow park lamp relay |
| 202 | — | Front wiper run/park relay |
| 203 | — | Trailer tow backup lamp relay |
| 204 | — | A/C clutch relay |
| 205 | — | Horn relay |
| 206 | — | Fog lamp relay |
| 207 | — | Front washer pump relay |
| 208 | — | Intercooler pump relay(supercharged engine only) |
| 209 | — | Front wiper HI/LO relay |
| 301 | — | Fuel pump relay |
| 302 | — | Trailer tow battery charge relay |
| 303 | — | Heated backlight relay(SuperCrew only) |
| 304 | — | PCM relay |
| 305 | — | Fuel pump HI/LO relay(supercharged engine only) |
| 306 | — | Inertia switch relay (supercharged engine only) |
| 401 | — | Not used |
| 501 | — | PCM diode |
| 502 | — | A/C compressor diode |
| 503 | — | Not used |
| 601 | CB | Power windows, Moonroof(SuperCrew only) |
| 602 | — | Not used |
2003 Ford F150 Passenger Compartment Fuse Panel
| Fuse/RelayLocation | Fuse AmpRating | Passenger Compartment FusePanel Description |
| 1 | 15A | Audio |
| 2 | 5A | Powertrain Control Module(PCM), Cluster |
| 3 | 20A | Cigar lighter, Data link connector |
| 4 | 5A | Power mirror switch, Mirror turn signal relays |
| 5 | 15A | Speed control module, Reverse lamp, Climate mode switch, Daytime Running Lamps (DRL) relay, Digital Transmission Range(DTR) sensor |
| 6 | 5A | Cluster, Brake shift interlock solenoid, GEM |
| 7 | — | Not used |
| 8 | 5A | Radio, Remote entry module, GEM, In-vehicle entertainment system (SuperCrew only) |
| 9 | — | Not used |
| 10 | — | Not used |
| 11 | 30A | Front washer pump relay, Wiper run/park relay, Wiper HI/LO relay, Windshield wiper motor |
| 12 | — | Not used |
| 13 | 20A | Stop lamp switch (Lamps), Turn/Hazard flasher |
| 14 | 15A | Battery saver relay, Interior lamp relay |
| 15 | 5A | Stop lamp switch (speed control, brake shift interlock), GEM, Rear Anti-lock Brake System (RABS) module |
| 16 | 20A | Headlamps (hi beams), Cluster(hi beam indicator) |
| 17 | — | Not used |
| 18 | 5A | Instrument illumination (dimmer switch power) |
| 19 | — | Not used |
| 20 | 5A | Audio, GEM, PCM, Transmission range sensor |
| 21 | 15A | DTR sensor, Clutch switch, Starter relay, I/P fuse 20 |
| 22 | 10A | Airbag module, Passenger airbag deactivation module |
| 23 | 10A | Trailer tow battery Charge relay, Turn/Hazard flasher, 4×4 solenoids, 4×4 relays, Overhead console, 4–Wheel Anti-lock Brake System (4WABS) module, ECmirror, Heated seats |
| 24 | 10A | Function selector switch assembly |
| 25 | 10A | Heated mirrors |
| 26 | 10A | Right-hand low beam headlamp |
| 27 | 5A | Foglamp relay and foglamp indicator, Main light switch(upstream) |
| 28 | 10A | Left-hand low-beam headlamp |
| 29 | 5A | Autolamp module, Transmission overdrive control switch, Central security module, Beltminder |
| 30 | 30A | Passive Anti-theft transceiver, Cluster, Ignition coils, PCM relay, Coil on plugs, Radio noise capacitor, ECC diode |
| 31 | — | Not used |
| Relay 1 | — | Interior lamp relay |
| Relay 2 | — | Battery saver relay |
| Relay 3 | — | Not used |
| Relay 4 | — | One-touch-down window relay |
| Relay 5 | — | Accessory delay relay |
2003 Ford F150 Standard fuse amperage rating and 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 |
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.
