Learn about Ford F-250 / F-350 / F-450 / F-550 (2000-2004) fuse box and relay’s locations, functions, and maintenance tips for optimal vehicle electrical system.
If you own a 2000-2004 Ford Super Duty truck and you’re experiencing issues like non-working power windows, a faulty trailer brake controller, or dashboard lights that flicker unexpectedly, a blown fuse or bad relay is often the culprit. Before you head to the repair shop, knowing where your Super Duty’s fuse boxes are located can help you diagnose—and often fix—the issue yourself.
Fuses and relays are essential safeguards for your truck’s electrical system. Fuses are designed to blow when a circuit experiences too much current, protecting wiring and components from damage or fire risk. Relays function as remote switches, using a small electrical signal to control higher-powered systems such as your headlights, fuel pump, or heavy-duty cooling fan.
For owners of the F-250, F-350, F-450, and F-550 Super Duty trucks from this era, understanding fuse box and relay locations is particularly useful given how many of these vehicles are used for towing, plowing, or commercial work with added electrical accessories. This guide will walk you through exactly where to find your fuse boxes and how to access them safely.
MUST READ: DYI – How to Check Car Fuses?
(2000-2004) Ford F-250 / F-350 / F-450 / F-550 fuse box and relay with Diagram
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
- Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Ford F-250 / F-350 / F-450 / F-550 (2000-2004) fuse assignment
Ford F-250 / F-350 / F-450 / F-550 Year of production: 2000, 2001, 2002, 2003, 2004
Fuse Box Locations in the 2000-2004 Super Duty Trucks
These heavy-duty trucks feature multiple fuse and relay locations designed to manage both standard electrical systems and additional work-related equipment. You’ll typically find two primary fuse boxes, along with additional relay panels depending on your truck’s specific configuration.
Engine Compartment Fuse Box (Power Distribution Box)
The main fuse box is located in the engine bay, mounted near the battery on the driver’s side. This Power Distribution Box houses high-amperage fuses and relays responsible for critical systems such as the headlights, engine cooling fan, ABS module, and glow plug relay (on diesel-equipped models like the 7.3L Power Stroke).
To access this fuse box, make sure the engine is off and the ignition key is removed. Locate the black plastic cover, which is typically secured with clips or retaining tabs along the edges. Depending on your trim level, you may need to unscrew a few fasteners before lifting the cover off. Once removed, you’ll find a fuse and relay diagram printed on the underside of the cover, helping you quickly match components to their corresponding circuits.
Interior Fuse Box (Passenger Compartment)
The interior fuse panel is located inside the cab, on the driver’s side, beneath the dashboard near the kick panel. This fuse box controls cabin electrical systems including the radio, power seats, interior lighting, power door locks, and dashboard instrumentation.
To access it, sit in the driver’s seat and look below the steering column near your left knee. The panel cover is usually secured with a latch or a couple of screws. Once opened, you’ll find the fuse layout along with a printed diagram on the inside of the cover, making it easy to identify which fuse controls which system.
Auxiliary Relay Panel (If Equipped)
Given the heavy-duty and commercial nature of these trucks, many 2000-2004 Super Duty models include an auxiliary relay panel for aftermarket equipment such as trailer brake controllers, snow plow lights, or power take-off (PTO) systems. This panel is typically located either in the engine bay near the primary fuse box or under the dashboard close to the interior fuse panel.
If your truck was factory-equipped with upfitter switches or came with a plow prep package, check near these areas for additional relays. Placement can vary depending on cab configuration (regular cab, SuperCab, or Crew Cab) and whether your truck is a single-rear-wheel or dual-rear-wheel (dually) model.
How to Safely Access and Work with Fuses and Relays
Safety should always be a priority when working with your truck’s electrical system. Turn off the ignition and remove the key before opening any fuse box. If you’re replacing several fuses or working near the battery terminals, disconnecting the negative battery cable adds an extra layer of protection against short circuits or accidental shocks.
When removing a fuse, use the plastic fuse-puller tool, typically clipped inside the fuse box cover. This tool grips the fuse securely without risking damage to the terminals. Avoid using metal tools like screwdrivers or pliers, as they can cause sparks or accidental short circuits if they touch multiple terminals at once.
Relays require a slightly different approach since they’re plugged into sockets rather than snapped into place like fuses. Gently rock the relay side to side while pulling upward to release it without bending the connector pins. If a relay feels stuck, check for a retaining clip or bracket before applying more force.
Identifying the Right Fuse or Relay
Every fuse and relay in your Super Duty’s fuse boxes is labeled with a number or letter that corresponds to a printed diagram, typically located on the inside of the fuse box cover or in your owner’s manual. This diagram identifies exactly which component each fuse or relay controls, from your power mirrors to your trailer brake system.
Before removing any fuse, cross-reference the diagram with the physical fuse box to confirm you’re addressing the correct circuit. This simple step saves time and prevents unnecessary disruption to unrelated systems while troubleshooting.
A blown fuse is usually easy to spot—look for a discolored appearance or a visibly broken metal strip inside the clear plastic housing. Always replace a blown fuse with one of the same amperage rating. Installing a higher-rated fuse can damage your truck’s wiring and create a fire hazard, so it’s important to match the replacement precisely.
Checking and Replacing Fuses in Ford F-250 / F-350 / F-450 / F-550
If electrical components in the vehicle are not working, a fuse may have blown. Blown fuses are identified by a broken wire within the fuse. Check the appropriate fuses before replacing any electrical components. To remove a fuse use the fuse puller tool provided on the fuse panel cover.
Location of Fuse Boxes
Passenger Compartment Fuse Panel:
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.
Power Distribution Box (1999-2001):
The power distribution box, trailer tow and electronic shift on the fly relay blocks are located in the engine compartment near the brake master cylinder. The power distribution box contains high-current fuses that protect your vehicle’s main electrical systems from overloads.
Fuse Box Diagrams
2000
Passenger Compartment Fuse Panel
List of fuses in the passenger compartment fuse panel (2000)
| № | A | Description |
|---|---|---|
| 1 | 20A | Turn/Hazard Lamps |
| 2 | 10A | Airbag Module |
| 3 | 20A | Cigar Lighter, Data Link Connector |
| 4 | 10A | Glove Box Lamp, Map Lamps, Power Mirrors, Underhood Lamp |
| 5 | – | Not Used |
| 6 | – | Not Used |
| 7 | 5A | Power Window/Lock Switch Illumination |
| 8 | 5A | Radio, Headlamp Switch Illumination |
| 9 | – | Not Used |
| 10 | 15A | Dual Fuel Tanks |
| 11 | 30A | Wiper Motor, Wiper Run/Park Relay Coil, Wiper Hi/LO Relay Coil, Washer Pump Relay Coil |
| 12 | 15A | Horn |
| 13 | 20A | Stop Lamps, Center High – mount Stop Lamp, Trailer Tow Stop Lamp, Speed Control |
| 14 | 10A | Dome Lamp, Cargo Lamp, Courtesy Lamps, Running Board Lamps |
| 15 | 5A | Stop Lamp Switch (Logic): Generic Electronic Module (GEM), Powertrain Control Module (PCM), Four Wheel Anti-lock Brake System (4WABS) Module, Brake Shift Interlock, Cluster and PCM Keep Alive Memory |
| 16 | 15A | Instrument Cluster, Hi-beam Headlamps |
| 17 | – | Not Used |
| 18 | – | Not Used |
| 19 | 10A | Auxiliary Powertrain Control Module (APCM) (Diesel only), Instrument Cluster, GEM Module, Overdrive Cancel Switch, Idle Validation Switch (Diesel only), Overhead Console, Diesel PCM via Clutch |
| 20 | 15A | Starter Motor Relay Coil, Clutch Switch |
| 21 | – | Not Used |
| 22 | 10A | Air Bag Module, Passenger Air Bag Activation/Deactivation Switch, Blower Motor Relay Coil |
| 23 | – | Not Used |
| 24 | 10A | A/C Clutch, Blend Door Actuator, Trailer Tow Battery Charge Relay Coil, Four Wheel Anti – Lock Brake System (4WABS), Turn Signal |
| 25 | – | Not Used |
| 26 | – | Not Used |
| 27 | 10A | Ignition Run Power Feed (Customer Access) |
| 28 | 10A | Brake Shift Interlock, DRL Relay Coil, Speed Control Module, Backup Lamps, Trailer Tow Backup Lamp Relay Coil, Electronic Shift On The Fly Hub Lock Solenoid, Vacuum Pump Motor |
| 29 | 5A | Instrument Cluster (Charge and Airbag Warning Lamps) |
| 30 | 30A | PCM Relay Coil, Ignition Coil (Gasoline only), Fuel Heater (Diesel only), Wastegate Solenoid (Diesel only), Injector Driver Module Relay Coil (Diesel only) |
| 31 | – | Not Used |
| Relay 1 | – | Interior Lamp Relay |
| Relay 2 | – | Not Used |
| Relay 3 | – | Horn |
| Relay 4 | – | Power Window One Touch Down Relay |
| Relay 5 | – | Accessory Delay Relay |
Power Distribution Box
List of fuses in the power distribution box (2000)
| № | A | Description |
|---|---|---|
| 1 | 7.5A* | Trailer Tow Left Stop/Turn Lamp |
| 2 | 10A* | Washer Pump |
| 3 | 7.5A* | Trailer Tow Right Stop/Turn Lamp |
| 4 | 20A* | Trailer Tow Backup Lamps, Trailer Tow Park Lamps |
| 5 | 20A* (Gasoline only) 5A* (Diesel only) | Gasoline only – PCM, Fuel Pump Relay Coil, Mass Air Flow Sensor, Fuel Injectors. Diesel only – Dual Alternator “A” Field. |
| 6 | 10A* | Gasoline only – A/C (CASS). Diesel only – Single or Dual Alternator “A” Field, Regulator. |
| 7 | 20A* (Gasoline only) 5A* (Diesel only) | Gasoline only – Vapor Management Valve, HEGO Sensors, Intake Manifold Communication Control, EVR Solenoid, PCM, Canister Vent Solenoid. Diesel only – Dual Alternator “A” Field. |
| 8 | 15A* | Trailer Tow Electronic Brake Illumination, Park Lamps, Trailer Tow Park Lamp Relay Coil |
| 9 | 10A* | Left Headlamp (Low Beam) |
| 10 | 20A* | Power Point |
| 11 | 10A* | Right Headlamp (Low Beam) |
| 12 | 15A* | Daytime Running Lamps (DRL) Resistor |
| 13 | 30A** | Multi-function Switch, Headlamps |
| 14 | 60A** | Anti – Lock Brake System |
| 15 | – | Not Used |
| 16 | 30A** | Trailer Tow Battery Charge |
| 17 | 30A** | Electronic Shift On The Fly Relay, Transfer Case Shift Motor |
| 18 | 30A** | Power Seat |
| 19 | 20A** | Fuel Pump Motor, PCM |
| 20 | 50A** | Ignition Switch (B4 & B5) |
| 21 | 50A** | Ignition Switch (B1 & B3) |
| 22 | 50A** | Junction Box Battery Feed |
| 23 | 40A** | Blower Motor |
| 24 | 30A** (Gasoline only) 20A** (Diesel only) | PCM Power |
| 25 | 30A*** | Power Windows |
| 26 | 20A** | If equipped with Remote Keyless Entry – Driver Door Unlock Relay Coil, All Door Unlock Relay Coil, All Door Lock Relay Coil, Park Lamp Flash Relay. If not equipped with Remote Keyless Entry – Power Door Lock Motors |
| 27 | 30A** (Diesel only) | Gasoline only – Not Used Diesel only – Injector Driver Module |
| 28 | 30A** | Trailer Tow Electronic Brake Controller |
| 29 | 20A** | Radio |
| 30 | – | PCM Power Relay |
| 31 | – | Blower Motor Relay |
| 32 | – | A/C CASS (Gasoline only), Injector Driver Module Power Relay (Diesel only) |
| 33 | – | Washer Pump Relay |
| 34 | – | Windshield Wiper Park/Run Relay |
| 35 | – | Windshield Wiper HI/LO Relay |
| 36 | – | A/C Clutch Diode |
| 37 | – | PCM Diode |
| 38 | – | Trailer Tow Backup Lamp Relay |
| 39 | – | Trailer Tow Battery Charge Relay |
| 40 | – | Electronic Shift On The Fly Relay #1 |
| 41 | – | Electronic Shift On The Fly Relay #2 |
| * Mini Fuses ** Maxi Fuses *** Circuit Breaker | ||
2001
Passenger Compartment Fuse Panel
List of fuses in the passenger compartment fuse panel (2001)
| № | A | Description |
|---|---|---|
| 1 | 20A | Turn/Hazard Lamps |
| 2 | – | Not Used |
| 3 | 20A | Cigar Lighter, Data Link Connector |
| 4 | 10A | Glove Box Lamp, Map Lamps, Power Mirrors, Underhood Lamp |
| 5 | – | Not Used |
| 6 | – | Not Used |
| 7 | 5A | Power Window/Lock Switch Illumination |
| 8 | 5A | Radio, Headlamp Switch Illumination |
| 9 | – | Not Used |
| 10 | 15A | Dual Fuel Tanks |
| 11 | 30A | Wiper Motor, Wiper Run/Park Relay Coil, Wiper Hi/LO Relay Coil, Washer Pump Relay Coil |
| 12 | 15A | Horn |
| 13 | 20A | Stop Lamps, Center High-mount Stop Lamp, Trailer Tow Stop Lamp, Speed Control |
| 14 | 10A | Dome Lamp, Cargo Lamp, Courtesy Lamps, Running Board Lamps |
| 15 | 5A | Stop Lamp Switch (Logic): Generic Electronic Module (GEM), Powertrain Control Module (PCM), Four Wheel Anti-lock Brake System (4WABS) Module, Brake Shift Interlock, Cluster and PCM Keep Alive Memory |
| 16 | 15A | Instrument Cluster, Hi-beam Headlamps |
| 17 | – | Not Used |
| 18 | 5A | Audio |
| 19 | 10A | Auxiliary Powertrain Control Module (APCM) (Diesel only), Instrument Cluster, GEM Module, Overdrive Cancel Switch, Idle Validation Switch (Diesel only), Overhead Console, Diesel PCM via Clutch |
| 20 | 15A | Starter Motor Relay Coil, Clutch Switch |
| 21 | – | Not Used |
| 22 | 10A | Passenger Air Bag Activation/Deactivation Switch, Blower Motor Relay Coil |
| 23 | 10A | Air Bag Module |
| 24 | 10A | A/C Clutch, Blend Door Actuator, Trailer Tow Battery Charge Relay Coil, Four Wheel Anti-Lock Brake System (4WABS), Turn Signal |
| 25 | – | Not Used |
| 26 | – | Not Used |
| 27 | 10A | Ignition Run Power Feed (Customer Access) |
| 28 | 15A | Brake Shift Interlock, DRL Relay Coil, Speed Control Module, Backup Lamps, Trailer Tow Backup Lamp Relay Coil, Electronic Shift On The Fly Hub Lock Solenoid, Vacuum Pump Motor |
| 29 | 5A | Instrument Cluster (Charge and Airbag Warning Lamps) |
| 30 | 30A | PCM Relay Coil, Ignition Coil (Gasoline only), Fuel Heater (Diesel only), Wastegate Solenoid (Diesel only), Injector Driver Module Relay Coil (Diesel only) |
| 31 | 5A | Fog Lamp Switch |
| Relay 1 | – | Interior Lamp Relay |
| Relay 2 | – | Not Used |
| Relay 3 | – | Horn |
| Relay 4 | – | Power Window One Touch Down Relay |
| Relay 5 | – | Accessory Delay Relay |
Power Distribution Box
List of fuses in the power distribution box (2001)
| № | A | Description |
|---|---|---|
| 1 | 7.5A* | Trailer Tow Left Stop/Turn Lamp |
| 2 | 10 A* | Washer Pump |
| 3 | 7.5A* | Trailer Tow Right Stop/Turn Lamp |
| 4 | 20A* | Trailer Tow Backup Lamps, Trailer Tow Park Lamps |
| 5 | 20A* (Gasoline only) 5A* (Diesel only) | Gasoline only – PCM, Fuel Pump Relay Coil, Mass Air Flow Sensor, Fuel Injectors. Diesel only – Dual Alternator “A” Field. |
| 6 | 10 A* | Gasoline only – A/C (CASS). Diesel only – Single or Dual Alternator “A” Field, Regulator. |
| 7 | 20A* (Gasoline only) 5A* (Diesel only) | Gasoline only – Vapor Management Valve, HEGO Sensors, Intake Manifold Communication Control, EVR Solenoid, PCM, Canister Vent Solenoid. Diesel only – Dual Alternator “A” Field. |
| 8 | 15A* | Trailer Tow Electronic Brake Illumination, Park Lamps, Trailer Tow Park Lamp Relay Coil |
| 9 | 10A* | Left Headlamp (Low Beam) |
| 10 | 20A* | Power Point |
| 11 | 10A* | Right Headlamp (Low Beam) |
| 12 | 15 A* | Daytime Running Lamps (DRL) Resistor, Fog Lamps |
| 13 | 30A** | Multi-function Switch, Headlamps |
| 14 | 60A** | Anti-Lock Brake System |
| 15 | 30A** | Heated Seats |
| 16 | 30A** | Trailer Tow Battery Charge |
| 17 | 30A** | Electronic Shift On The Fly Relay, Transfer Case Shift Motor |
| 18 | 30A** | Power Seat, Adjustable Pedais |
| 19 | 20A** | Fuel Pump Motor, PCM |
| 20 | 50A** | Ignition Switch (B4 & B5) |
| 21 | 50A** | Ignition Switch (BI & B3) |
| 22 | 50A** | Junction Box Battery Feed |
| 23 | 40A** | Blower Motor |
| 24 | 30A** (Gasoline only) 20A** (Diesel only) | PCM Power |
| 25 | 30A*** | Power Windows |
| 26 | 20A** | If equipped with Remote Keyless Entry – Driver Door Unlock Relay Coil, All Door Unlock Relay Coil, All Door Lock Relay Coil, Park Lamp Flash Relay. If not equipped with Remote Keyless Entry – Power Door Lock Motors. |
| 27 | 30A** (Diesel only) | Gasoline only – Not Used. Diesel only – Injector Driver Module. |
| 28 | 30A** | Trailer Tow Electronic Brake Controller |
| 29 | 20A** | Radio |
| 30 | – | PCM Power Relay |
| 31 | – | Blower Motor Relay |
| 32 | – | A/C CASS (Gasoline only), Injector Driver Module Power Relay (Diesel only) |
| 33 | – | Washer Pump Relay |
| 34 | – | Windshield Wiper Park/Run Relay |
| 35 | – | Windshield Wiper HI/LO Relay |
| 36 | – | A/C Clutch Diode |
| 37 | – | PCM Diode |
| 38 | – | Trailer Tow Backup Lamp Relay |
| 39 | – | Trailer Tow Battery Charge Relay |
| 40 | – | Electronic Shift On The Fly Relay #1 |
| 41 | – | Electronic Shift On The Fly Relay #2 |
| * Mini Fuses ** Maxi Fuses *** Circuit Breaker | ||
2002
Passenger Compartment Fuse Panel
List of fuses in the passenger compartment fuse panel / power distribution box (2002)
| № | A | Description |
|---|---|---|
| 1 | 15A* | Adjustable pedais |
| 2 | – | Not used |
| 3 | – | Not used |
| 4 | 20A* | Power point – instmment panei |
| 5 | – | Not used |
| 6 | 20A* | Trailer tow turn/stop relay |
| 7 | 30A* | High beam headlamps/Flash to pass |
| 8 | – | Not used |
| 9 | – | Not used |
| 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 | – | Not used |
| 21 | – | Not used |
| 22 | 20A* | Engine control |
| 23 | 20A* | Engine control (gasoline engine only) |
| 24 | 15A* | Not used (spare) |
| 25 | 10A* | 4 – Wheel Anti – lock Brake System (4WABS) module |
| 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) |
| 32 | 5A* | Radio (start) |
| 33 | 15A* | Front wiper |
| 34 | 10A* | Brake on-off switch |
| 35 | 10A* | Instrument cluster |
| 36 | 10A* | PCM Keep – Alive |
| 37 | 15A* | Horn |
| 38 | 20A* | Trailer tow park lamps and backup lamps |
| 39 | – | Not used |
| 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 |
| 104 | – | Not used |
| 105 | 30A** | Injector driver module (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*** | Door window motors |
| 602 | 60A** | 4WABS module |
| 210 | – | Not used |
| 211 | – | Not used |
| 212 | – | Not used |
| 301 | – | Front blower motor relay |
| 302 | – | Powertrain (EEC) relay |
| 303 | – | Injector driver module relay (Diesel engine only) |
| 304 | – | Not used |
| 305 | – | Trailer tow battery charge relay |
| 306 | – | Delayed accessory relay |
| 307 | – | Starter relay |
| * Mini Fuses ** Maxi Fuses *** Circuit Breaker | ||
2003
Passenger Compartment Fuse Panel
List of fuses in the passenger compartment fuse panel / power distribution box (2003)
| № | A | Description |
|---|---|---|
| 1 | 15A* | Adjustable pedais |
| 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 | ||
2004
Passenger Compartment Fuse Panel
List of fuses in the passenger compartment fuse panel / power distribution box (2004)
| № | A | Description |
|---|---|---|
| 1 | 15A* | Adjustable pedais |
| 2 | – | Not used |
| 3 | – | Not used |
| 4 | 20A* | Power point – instmment 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 mnning 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 | ||
Conclusion
Understanding the fuse box and relay locations in your 2000-2004 Ford F-250, F-350, F-450, or F-550 Super Duty truck gives you the confidence to troubleshoot common electrical issues, whether you’re dealing with towing equipment, plow accessories, or standard cab electronics. From the engine bay’s Power Distribution Box to the auxiliary relay panel, knowing these locations makes diagnosing and resolving problems much more manageable.
That said, if you’ve checked the relevant fuses and relays and your electrical issue persists, it’s worth consulting a qualified mechanic, especially given the added complexity of aftermarket equipment commonly installed on these work trucks. Persistent electrical problems can indicate deeper wiring issues that require professional diagnostic tools to resolve safely and correctly.
