2015 Ford F-350 Super Duty – Fuse Box Diagram & Amperage
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Quick answer
The 2015 Ford F-350 Super Duty has three main fuse box locations:
- Under-hood Fuse Box: Located in the engine compartment, typically near the battery on the driver's side.
- Smart Junction Box (SJB) / Passenger Compartment Fuse Box: Located behind the passenger kick panel.
- Trailer Brake Control (TBC) Module Fuse Box (Optional): Some trims may have an additional fuse panel for trailer-specific circuits, often found under the dash or in the engine bay.
Under-hood Fuse Box
This fuse box is located in the engine compartment, usually on the driver's side near the battery. It contains fuses and relays for critical engine functions, lighting, and other high-current systems.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 20A | Yellow | Powertrain Control Module (PCM) / Engine Control Module (ECM) |
| F2 | 10A | Red | Ignition Coils / Fuel Pump Relay |
| F3 | 30A | Green | Fuel Pump |
| F4 | 20A | Yellow | Anti-lock Brake System (ABS) Valve |
| F5 | 40A | Green | Anti-lock Brake System (ABS) Pump |
| F6 | 15A | Blue | Headlights (Low Beam - Left) |
| F7 | 15A | Blue | Headlights (Low Beam - Right) |
| F8 | 10A | Red | Headlights (High Beam - Left) |
| F9 | 10A | Red | Headlights (High Beam - Right) |
| F10 | 20A | Yellow | Trailer Brake Control (TBC) Module |
| F11 | 30A | Green | Blower Motor (Front) |
| F12 | 15A | Blue | A/C Clutch Relay |
| F13 | 20A | Yellow | Starter Relay Coil |
| F14 | 25A | Clear | Trailer Tow Parking Lamps |
| F15 | 20A | Yellow | Fog Lamps (if equipped) |
| F16 | 10A | Red | Horn |
| F17 | 30A | Green | Wiper Motor (High Speed) |
| F18 | 20A | Yellow | Wiper Motor (Low Speed) |
| F19 | 10A | Red | Powertrain Control Module (PCM) Keep Alive Power |
| F20 | 10A | Red | Transmission Control Module (TCM) |
| F21 | 20A | Yellow | Upfitter Switches (if equipped) |
| F22 | 25A | Clear | Power Distribution Box (PDB) Battery Feed |
| F23 | 15A | Blue | Oxygen Sensors |
| F24 | 15A | Blue | Mass Air Flow (MAF) Sensor |
| F25 | 10A | Red | Glow Plug Control Module (Diesel) |
| F26 | 20A | Yellow | Electronic Shift On The Fly (ESOF) Solenoids |
| F27 | 10A | Red | Four Wheel Drive (4WD) Module |
| F28 | 50A | Red | Main Power Distribution (Trailer) |
| F29 | 30A | Green | Auxiliary Power Outlet (Console) |
| F30 | 30A | Green | Auxiliary Power Outlet (Dash) |
Relay Locations (Under-hood):
- R1: Fuel Pump Relay
- R2: Starter Relay
- R3: PCM Relay
- R4: A/C Clutch Relay
- R5: High Beam Headlight Relay
- R6: Low Beam Headlight Relay
- R7: Blower Motor Relay
- R8: Horn Relay
- R9: Wiper Motor Relay
(Note: Always refer to the fuse box lid diagram for the exact layout and amperage values, as these can vary slightly by trim level and optional equipment.)
Smart Junction Box (SJB) / Passenger Compartment Fuse Box
This fuse box is located behind the passenger kick panel, accessible by removing the trim panel. It primarily handles interior electrical components, accessories, and body control functions.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10A | Red | Radio / Infotainment System |
| F2 | 15A | Blue | Accessory Delay Relay |
| F3 | 10A | Red | Instrument Cluster |
| F4 | 20A | Yellow | Power Windows (Front) |
| F5 | 20A | Yellow | Power Windows (Rear) |
| F6 | 15A | Blue | Power Door Locks |
| F7 | 10A | Red | Turn Signals / Hazard Lights |
| F8 | 10A | Red | Brake Pedal Position (BPP) Sensor |
| F9 | 15A | Blue | Power Mirrors / Heated Mirrors (if equipped) |
| F10 | 15A | Blue | Interior Lamps / Dome Light |
| F11 | 10A | Red | Airbag (Supplemental Restraint System - SRS) Module |
| F12 | 10A | Red | Occupant Classification System (OCS) |
| F13 | 20A | Yellow | Cigar Lighter / 12V Power Outlet (Front) |
| F14 | 10A | Red | Radio Memory / Constant Power |
| F15 | 7.5A | Brown | On-Board Diagnostics (OBD-II) Port |
| F16 | 15A | Blue | Audio Amplifier (if equipped) |
| F17 | 10A | Red | Climate Control Module |
| F18 | 10A | Red | Rear Defrost Relay |
| F19 | 10A Red | Park Lamps / Tail Lamps | |
| F20 | 10A | Red | License Plate Lamps |
| F21 | 15A | Blue | Wiper Delay Module |
| F22 | 15A | Blue | Washer Pump |
| F23 | 10A | Red | Reverse Lamps |
| F24 | 15A | Blue | Power Seat (Driver) |
| F25 | 15A | Blue | Power Seat (Passenger) |
| F26 | 10A | Red | Heated Steering Wheel (if equipped) |
| F27 | 10A | Red | Side Marker Lamps |
| F28 | 20A | Yellow | Trailer Tow Battery Charge Relay (if equipped) |
| F29 | 20A | Yellow | Trailer Tow Stop/Turn Lamps (Left) |
| F30 | 20A | Yellow | Trailer Tow Stop/Turn Lamps (Right) |
(Note: Consult your owner's manual or the fuse box legend for specific fuse assignments and amperage, as variations exist.)
Trailer Brake Control Module Fuse Box (Optional)
Some F-350 Super Duty models, especially those with factory trailer brake controllers, may have a dedicated fuse box or fuses within the main under-hood box for trailer-specific functions. Always verify with your vehicle's documentation.
| Fuse # (Typical) | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F10 (Under-hood) | 20A | Yellow | Trailer Brake Control (TBC) Module Power |
| F28 (SJB) | 20A | Yellow | Trailer Tow Battery Charge Relay |
| F29 (SJB) | 20A | Yellow | Trailer Tow Stop/Turn Lamps (Left) |
| F30 (SJB) | 20A | Yellow | Trailer Tow Stop/Turn Lamps (Right) |
| F14 (Under-hood) | 25A | Clear | Trailer Tow Parking Lamps |
| - | 40A | Green | Trailer Brake Controller (Main Power, often a resettable breaker or large fuse in the under-hood box) |
(Reminder: Always check your vehicle's specific fuse box legend or owner's manual for accurate details.)
How to test a fuse
Testing a fuse is a straightforward process and only requires a few basic tools:
- Safety First: Ensure the vehicle is turned off, and the ignition key is removed. Disconnect the negative terminal of the battery if you're uncomfortable working with live circuits.
- Locate the Fuse Box: Identify the fuse box you need to check. Refer to your owner's manual for precise locations.
- Identify the Suspect Fuse: Consult the fuse box diagram to find the fuse associated with the component or circuit that isn't working.
- Visual Inspection: Many fuses have a clear plastic body. Look for a broken or burnt wire inside the fuse. If it's broken, the fuse is blown.
- Use a Fuse Tester or Multimeter:
- Fuse Tester: A simple fuse tester lights up if the fuse is good. Touch the probes to the small metal test points on the top of the fuse.
- Multimeter: Set your multimeter to the continuity or ohms setting. Remove the suspect fuse from its slot. Touch one probe to each metal blade of the fuse. If the multimeter beeps or shows a reading close to zero ohms, the fuse is good. If it shows
Before you pull a fuse on the 2015 Ford F-350 Super Duty
- Use the label printed on the panel cover or the owner's manual for your exact build. Layouts change with options, model year and build date, so a chart for another truck can be wrong.
- Replace a blown fuse only with the same amp rating. A larger fuse can let wiring overheat.
- A fuse that blows again right away means a short or failing component downstream. Find the cause before replacing it again.
- A good fuse doesn't prove the circuit works — relays, grounds and connectors fail too.
- Disconnect the battery before working near high-current fuses or cables.
Learn more: How fuses, relays and truck electrical systems work
More specs for the 2015 Ford F-350 Super Duty
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
2014 F-350 Super Duty
2016 F-350 Super Duty
2017 F-350 Super Duty
2018 F-350 Super Duty
2019 F-350 Super Duty
2020 F-350 Super Duty
Maintenance & repair guides
2015 Ford F-350 Super Duty Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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