2020 Ford F-150 Fuse Box Diagram & Amperage

Quick Answer

The 2020 Ford F-150 typically has two main fuse box locations: the Under-hood Fuse Box (also known as the Power Distribution Box) located in the engine compartment, and the Passenger Compartment Fuse Box (also known as the Smart Junction Box) located behind the passenger kick panel.

Under-hood Fuse Box (Power Distribution Box)

This fuse box is located in the engine compartment, near the battery on the driver's side. It contains high-current fuses and relays for major electrical components.

Relay Locations (Under-hood):

• R1: Fuel Pump Relay
• R2: Starter Relay
• R3: A/C Clutch Relay
• R4: Cooling Fan Relay 1
• R5: Cooling Fan Relay 2
• R6: Horn Relay

Passenger Compartment Fuse Box (Smart Junction Box)

This fuse box is located inside the cabin, behind the passenger side kick panel. You will need to remove the kick panel to access it. It typically manages lower-current circuits for interior accessories and vehicle electronics.

Relay Locations (Passenger Compartment):

• R7: Accessory Delay Relay
• R8: Wiper Motor Relay
• R9: Trailer Tow Park Lamps Relay (if equipped)

Important Note on Trim Variations: Ford F-150 models can have different trim levels, engine options, and installed features (e.g., trailer tow packages, premium sound systems). This means the exact fuse box configuration and numbering may vary slightly. Always refer to the fuse layout diagram printed on the inside of your fuse box lid or in your vehicle's owner's manual for the most accurate information specific to your 2020 Ford F-150.

How to Test a Fuse

Testing a fuse is a straightforward process and a good first step when troubleshooting an electrical issue. Here's how:

1. Locate the Fuse Box: Identify which fuse box (under-hood or passenger compartment) houses the fuse for the circuit you're troubleshooting.
2. Identify the Suspect Fuse: Consult your fuse box diagram (from your owner's manual or the lid itself) to find the specific fuse number and rating for the component that's not working.
3. Turn Off the Vehicle: Always turn off the ignition and remove the key for safety before handling fuses.
4. Remove the Fuse: Use the plastic fuse puller tool (often found in the fuse box or tool kit) to carefully remove the suspect fuse. If you don't have one, small needle-nose pliers can work, but be gentle.
5. Visually Inspect: Hold the fuse up to a light. If the metal wire or strip inside is broken or melted, the fuse is blown and needs replacement.
6. Use a Multimeter (for a more precise test):
   • Set your multimeter to the continuity setting (often indicated by a speaker icon) or resistance (Ohms Ω) setting.
   • Touch the two probes of the multimeter to the two metal blades on top of the fuse (or the test points if present). It does not matter which probe goes to which blade.
   • If the fuse is good, the multimeter will beep (continuity) or show a reading very close to zero ohms. If the fuse is blown, it will show an open circuit (OL or infinity).
7. Replace (if necessary): If the fuse is bad, replace it with a new fuse of the exact same amperage (AMP) rating and type. Using a fuse with a higher amperage rating can lead to serious electrical damage or fire.

Common Blown Fuses on This Vehicle

While any fuse can blow, certain circuits are more prone to issues due to their constant use or the components they protect. On the 2020 Ford F-150, common blown fuses (and what to check first) can include:

• Cigar Lighter / 12V Power Outlets (F22, F23): These often blow when accessories with too much current are plugged in, or if there's a short within the device being charged. Check the device you plugged in before replacing the fuse.
• Blower Motor (F11): A failing blower motor, a clogged cabin air filter, or an issue with the blower motor resistor can cause this fuse to blow due to increased current draw. Inspect the cabin air filter and listen for unusual noises from the blower motor.
• Radio / Infotainment (F21): Issues with the head unit, wiring, or aftermarket accessories can sometimes cause this fuse to blow. Consider recent accessory installations or system changes.
• Trailer Brake Controller (F15): Problems with trailer wiring, a short in the trailer's electrical system, or an overloaded circuit can trip this fuse. Always inspect trailer wiring and connections if this fuse blows when a trailer is attached.
• Headlights (F5, F6, F7, F8): While less common, a short in the headlight assembly or wiring could cause a fuse to blow. Check for any visible damage to the headlight housing or wiring.

If a fuse blows immediately after replacement, there is likely a short circuit in the wiring or the component it protects. Do not continue to replace fuses without addressing the underlying issue, as this can cause further damage.

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