2021 Ford Explorer Fuse Box Diagram & Amperage Guide
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Quick answer
The 2021 Ford Explorer features three main fuse box locations: under the hood (Battery Junction Box), behind the passenger side of the dashboard (Smart Junction Box), and in the rear cargo area (Rear Junction Box).
Under-Hood Fuse Box (Battery Junction Box)
Located in the engine bay on the passenger side, this fuse box handles high-current circuits for essential vehicle systems. Always disconnect the battery before servicing fuses or relays in this box.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 20A | Yellow | Powertrain Control Module (PCM)/Engine Control Module (ECM) |
| F2 | 20A | Yellow | Powertrain Control Module (PCM)/Engine Control Module (ECM) - Ignition |
| F3 | 15A | Blue | Fuel Pump Relay |
| F4 | 20A | Yellow | Starter Solenoid |
| F5 | 30A | Green | Anti-lock Brake System (ABS) Pump Motor |
| F6 | 20A | Yellow | ABS Valves |
| F7 | 10A | Red | Headlamp (Low Beam, Right) |
| F8 | 10A | Red | Headlamp (Low Beam, Left) |
| F9 | 15A | Blue | Headlamp (High Beam, Right) |
| F10 | 15A | Blue | Headlamp (High Beam, Left) |
| F11 | 20A | Yellow | Horn / Horn Relay |
| F12 | 20A | Yellow | Blower Motor Relay |
| F13 | 10A | Red | Air Conditioning (A/C) Clutch |
| F14 | 15A | Blue | Ignition Coils / Spark Plugs (Right Bank) |
| F15 | 15A | Blue | Ignition Coils / Spark Plugs (Left Bank) |
| F16 | 20A | Yellow | Power Distribution Box (Interior) Feed |
| F17 | 15A | Blue | O2 Sensors (Heated Oxygen Sensors) |
| F18 | 10A | Red | Transmission Control Module (TCM) |
| F19 | 15A | Blue | Wiper Motor (Front) |
| F20 | 10A | Red | Washer Pump (Front) |
| F21 | 30A | Green | Trailer Brake Controller (if equipped) |
| F22 | 20A | Yellow | Auxiliary Power Outlet (Console) |
| F23 | 20A | Yellow | Auxiliary Power Outlet (Cargo Area) |
Relay Locations (Under-Hood):
- R1: Fuel Pump Relay
- R2: Starter Relay
- R3: Horn Relay
- R4: Blower Motor Relay
- R5: A/C Clutch Relay
- R6: High Beam Headlamp Relay
- R7: Low Beam Headlamp Relay
- R8: PCM/ECM Power Relay
Passenger Side Dashboard Fuse Box (Smart Junction Box)
This fuse box is located behind the passenger side kick panel. Carefully remove the kick panel to access the fuses. This box manages many interior electrical components.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F30 | 15A | Blue | Radio/Infotainment System |
| F31 | 10A | Red | SYNC Module / USB Ports |
| F32 | 10A | Red | Instrument Cluster |
| F33 | 10A | Red | Airbag Control Module (RCM) |
| F34 | 10A | Red | Occupant Classification System (OCS) |
| F35 | 20A | Yellow | Blower Motor (Heater/AC) |
| F36 | 15A | Blue | Power Windows (Front Passenger) |
| F37 | 15A | Blue | Power Windows (Rear Right) |
| F38 | 15A | Blue | Power Door Locks |
| F39 | 10A | Red | Cabin Fuse / Interior Lighting |
| F40 | 15A | Blue | Cigar Lighter/12V Power Outlet |
| F41 | 10A | Red | Steering Wheel Controls |
| F42 | 5A | Tan | Climate Control Module |
| F43 | 7.5A | Brown | Rear Defroster Relay Coil |
| F44 | 15A | Blue | Sunroof (if equipped) |
| F45 | 10A | Red | Headlamp Switch |
| F46 | 15A | Blue | Turn Signal/Hazard Flasher |
| F47 | 10A | Red | Parking Lamps (Left Side) |
| F48 | 10A | Red | Parking Lamps (Right Side) |
| F49 | 10A | Red | Auxiliary Fuse Feed (Specific Trims) |
| F50 | 10A | Red | Rear Wiper Motor |
Rear Cargo Area Fuse Box (Rear Junction Box)
This fuse box is typically located on the driver's side of the cargo area, behind a trim panel. It handles power for many rear accessories and features.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F60 | 20A | Yellow | Trailer Tow Module |
| F61 | 20A | Yellow | Power Liftgate (if equipped) |
| F62 | 15A | Blue | Tail Lamps (Left) |
| F63 | 15A | Blue | Tail Lamps (Right) |
| F64 | 10A | Red | License Plate Lamps |
| F65 | 10A | Red | Brake Lamps |
| F66 | 20A | Yellow | Power Outlet (Rear Cargo) |
| F67 | 15A | Blue | Heated Seats (Rear, if equipped) |
| F68 | 10A | Red | Rear Entertainment System (if equipped) |
| F69 | 30A | Green | Rear Window Defroster |
| F70 | 15A | Blue | Fuel Filler Door Actuator |
How to Test a Fuse
Testing a fuse is a straightforward process that can help you diagnose electrical issues. You will need a fuse puller (often located in one of the fuse boxes) and a multimeter or a fuse tester tool.
- Locate the Fuse Box: Identify which fuse box contains the fuse you suspect is blown using the diagrams above and your vehicle's owner's manual.
- Turn Off the Vehicle: Ensure the ignition is off and, if possible, disconnect the negative battery terminal to prevent accidental short circuits, especially when working in the under-hood fuse box.
- Identify the Suspect Fuse: Refer to the fuse box diagram to pinpoint the specific fuse related to the malfunctioning component.
- Visually Inspect: Many fuses (especially mini and ATO blade fuses) have a clear plastic body. Look for a broken or burnt metal wire inside the fuse. If the wire is visibly broken, the fuse is blown.
- Use a Multimeter or Fuse Tester:
- Multimeter: Set your multimeter to the continuity or ohm setting. Touch one probe to each metal terminal on top of the fuse. A good fuse will show a reading close to zero ohms (continuity). If there's no reading or an
Before you pull a fuse on the 2021 Ford Explorer
- 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 2021 Ford Explorer
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
Maintenance & repair guides
2021 Ford Explorer 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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