2020 Ford Ranger Fuse Box Diagram & Amperage Guide
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Quick Answer
The 2020 Ford Ranger features two main fuse box locations: one under the hood (Battery Junction Box) and another inside the cabin (Smart Junction Box/Body Control Module). There is no fuse box located in the trunk or cargo area for this vehicle.
Under-Hood Fuse Box (Battery Junction Box)
The under-hood fuse box, also known as the Battery Junction Box (BJB), is located in the engine compartment on the driver's side, near the battery. It contains high-current fuses and relays for critical engine and vehicle systems.
Relays:
- R1: Powertrain Control Module (PCM)/Engine Control Module (ECM) Relay
- R2: Fuel Pump Relay
- R3: Starter Relay
- R4: Cooling Fan Relay 1
- R5: Cooling Fan Relay 2 (if equipped)
- R6: Horn Relay
- R7: A/C Clutch Relay
- R8: Headlight Low Beam Relay (Left)
- R9: Headlight Low Beam Relay (Right)
- R10: Headlight High Beam Relay
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 20A | Yellow | Powertrain Control Module (PCM)/ECM |
| F2 | 15A | Blue | Fuel Pump |
| F3 | 30A | Green | Starter Motor |
| F4 | 20A | Yellow | Ignition Coils / Engine Sensors |
| F5 | 15A | Blue | ABS Module |
| F6 | 10A | Red | Headlight Low Beam (Left) |
| F7 | 10A | Red | Headlight Low Beam (Right) |
| F8 | 15A | Blue | Headlight High Beam |
| F9 | 10A | Red | Tail Lights / Parking Lights |
| F10 | 10A | Red | Brake Lights (Stop Lamps) |
| F11 | 40A | Green | Blower Motor (Main) |
| F12 | 10A | Red | A/C Clutch |
| F13 | 30A | Green | Trailer Brake Controller (if equipped) |
| F14 | 20A | Yellow | Power Steering Control Module |
| F15 | 20A | Yellow | Oxygen Sensors |
| F16 | 15A | Blue | Transmission Control Module (TCM) |
| F17 | 25A | Clear | ABS Pump Motor |
| F18 | 10A | Red | Horn |
| F19 | 15A | Blue | Fog Lights (if equipped) |
| F20 | 20A | Yellow | Powertrain Control Module (PCM) Main Power |
| F21 | 30A | Green | Glow Plugs (Diesel, if equipped) |
| F22 | 20A | Yellow | Heated Seats (if equipped) |
| F23 | 10A | Red | Left Headlight DRL (if equipped) |
| F24 | 10A | Red | Right Headlight DRL (if equipped) |
| F25 | 5A | Tan | Engine Sensor Power |
| F26 | 15A | Blue | Adaptive Cruise Control (if equipped) |
| F27 | 20A | Yellow | Power Inverter (if equipped) |
| F28 | 5A | Tan | Electronic Power Steering (EPS) Control Signal |
| F29 | 10A | Red | Emissions Control System |
| F30 | 15A | Blue | Trailer Tow Left Stop/Turn Lamp |
| F31 | 15A | Blue | Trailer Tow Right Stop/Turn Lamp |
| F32 | 20A | Yellow | Trailer Tow Park Lamps |
| F33 | 10A | Red | Main Headlight/High Beam Relay Coil |
| F34 | 15A | Blue | Fuel Injectors |
| F35 | 20A | Yellow | Emissions Control System heater (e.g., EVAP) |
Note: Fuse configurations may vary slightly based on trim level and optional equipment. Always refer to the fuse legend printed on the underside of your fuse box lid for the most accurate information.
Interior Fuse Box (Smart Junction Box/Body Control Module)
The interior fuse box, often referred to as the Smart Junction Box (SJB) or Body Control Module (BCM), is located behind the passenger side kick panel. You'll need to remove the kick panel to access it. This box handles many of the vehicle's interior electrical components, accessories, and body control functions.
Relays (Integrated into SJB - not typically serviceable individually):
- Wiper Relay
- Turn Signal Relays
- Power Window Relays
- Accessory Delay Relay
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10A | Red | Radio/Infotainment System |
| F2 | 20A | Yellow | Cigar Lighter / 12V Power Outlet (Front) |
| F3 | 15A | Blue | Accessory Delay (Power Windows, Radio) |
| F4 | 10A | Red | Instrument Cluster |
| F5 | 7.5A | Brown | Airbag System (Supplemental Restraint System) |
| F6 | 15A | Blue | Power Door Locks |
| F7 | 10A | Red | BCM Main Power / Interior Lighting |
| F8 | 10A | Red | Wiper Motor (Front) |
| F9 | 5A | Tan | Climate Control Module |
| F10 | 15A | Blue | Rear 12V Power Outlet (if equipped) |
| F11 | 10A | Red | USB Ports / Auxiliary Input |
| F12 | 5A | Tan | Steering Wheel Controls |
| F13 | 20A | Yellow | Power Windows (Driver) |
| F14 | 20A | Yellow | Power Windows (Passenger) |
| F15 | 10A | Red | Turn Signals / Hazard Lights |
| F16 | 15A | Blue | Backup Lights (Reverse Lamps) |
| F17 | 5A | Tan | Dome Light / Map Lights |
| F18 | 10A | Red | Heated Mirrors (if equipped) |
| F19 | 7.5A | Brown | Data Link Connector (OBD-II Port) |
| F20 | 15A | Blue | Power Seat (Driver, if equipped) |
| F21 | 15A | Blue | Power Seat (Passenger, if equipped) |
| F22 | 5A | Tan | Rearview Mirror / Auto-Dimming (if equipped) |
| F23 | 10A | Red | Sunroof (if equipped) |
| F24 | 5A | Tan | Remote Keyless Entry / Passive Anti-Theft System |
| F25 | 10A | Red | Occupant Classification System |
| F26 | 15A | Blue | Trailer Tow Module (Interior power, if equipped) |
| F27 | 10A | Red | Blind Spot Information System (BLIS) |
| F28 | 5A | Tan | Lane Keeping System (if equipped) |
| F29 | 10A | Red | SYNC/Infotainment Amplifier (if equipped) |
| F30 | 20A | Yellow | A/C Blower Motor Controller (Resistor) |
| F31 | 10A | Red | Headlamp Switch / Taillamp Sense |
| F32 | 15A | Blue | Wiper Motor (Rear, if equipped) |
| F33 | 5A | Tan | Push Button Start (if equipped) |
| F34 | 10A | Red | Steering Column Lock |
| F35 | 10A | Red | Hill Descent Control (if equipped) |
Note: Fuse layouts are subject to minor variations. Always check the diagram on the back of your fuse box cover for the most accurate information for your specific vehicle configuration.
How to Test a Fuse
Testing a fuse is a straightforward process that can help diagnose electrical issues. Here's how to do it:
- Locate the Fuse Box: Identify the fuse box relevant to the circuit you're troubleshooting. Refer to the diagrams above.
- Turn Off the Ignition: Ensure the vehicle is off to prevent electrical shocks or damage.
- Identify the Suspect Fuse: Look at your fuse box diagram to find the fuse for the component that isn't working.
- Visually Inspect the Fuse: Carefully pull the fuse straight out using a fuse puller (usually found in the fuse box or tool kit). Hold it up to the light. A good fuse will have a continuous wire or metal strip inside. A blown fuse will have a broken or melted wire.
- Use a Multimeter (for a more accurate test):
- Set your multimeter to the continuity setting (often indicated by a speaker icon) or the lowest ohms setting.
- Touch one probe of the multimeter to each metal blade of the fuse.
- Good Fuse: The multimeter will beep (if on continuity setting) or show a reading close to 0 ohms, indicating a continuous circuit.
- Blown Fuse: The multimeter will show no reading or
Before you pull a fuse on the 2020 Ford Ranger
- 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 2020 Ford Ranger
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
2020 Ford Ranger 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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