2022 Ford F-350 Super Duty Fuse Box Diagram & Amperage

Quick Answer

The 2022 Ford F-350 Super Duty typically has three fuse box locations:

• Under-Hood Fuse Box: Located in the engine compartment, usually on the driver's side.
• Passenger Compartment Fuse Box: Located behind the kick panel on the passenger side.
• Rear Under-Seat/Cargo Fuse Box: Located under the rear seat on the passenger side or in the cargo area.

Under-Hood Fuse Box

The under-hood fuse box contains larger fuses and relays that protect critical powertrain and high-current systems. Always refer to the fuse diagram on the inside of the fuse box cover for the exact layout for your vehicle's trim level.

Under-Hood Relays:

• R1: Fuel Pump Relay
• R2: Starter Relay
• R3: PCM/ECM Relay
• R4: Blower Motor Relay
• R5: A/C Clutch Relay

Passenger Compartment Fuse Box

This fuse box, often located behind the kick panel on the passenger side, protects various interior electrical components and accessories. The exact location might vary slightly based on trim. Refer to the diagram on the back of the fuse box cover.

Rear Under-Seat/Cargo Fuse Box

Some 2022 Ford F-350 Super Duty models may have an additional fuse box located under the rear seat on the passenger side or within the cargo area. This box typically handles circuits for rear accessories, trailer connections, and other optional equipment. Always consult your owner's manual and the fuse box cover for accurate information for your specific vehicle configuration.

How to Test a Fuse

Testing a fuse is a straightforward process. You'll need a fuse puller (usually found in the fuse box cover) and a fuse tester or a multimeter.

1. Locate the suspect fuse: Identify the fuse that corresponds to the component that isn't working. Refer to your vehicle's fuse box diagram.
2. Turn off the ignition: Ensure the vehicle's ignition is off to prevent electrical shorts.
3. Remove the fuse: Use the fuse puller to carefully remove the fuse from its slot.
4. Visually inspect: Hold the fuse up to the light. If the metal wire or filament inside is broken or charred, the fuse is blown and needs replacement.
5. Test with a fuse tester/multimeter (optional but recommended):
   • Fuse Tester: Most fuse testers have two prongs. Touch one prong to each metal terminal on top of the fuse. If the tester lights up, the fuse is good. If not, it's blown.
   • Multimeter: Set your multimeter to the continuity setting (often indicated by a speaker symbol). Touch one probe to each metal terminal of the fuse. A good fuse will show a reading of zero ohms or make a beeping sound, indicating continuity. A blown fuse will show an "OL" (open loop) or no sound.
6. Replace with the correct fuse: If the fuse is blown, replace it with a new fuse of the exact same amperage rating and type. Using a fuse with a higher amperage can lead to serious electrical damage or fire.

Common Blown Fuses on This Vehicle

While any fuse can blow, some are more common than others due to usage or potential issues. If you experience one of the following problems, start by checking these fuses:

• Cigar Lighter/12V Outlets Not Working: This is a very common issue, often caused by overloading the outlet with accessories or a foreign object falling into the socket. Check the fuses for "Auxiliary Power Outlet" or "Cigar Lighter" in the passenger compartment and potentially the rear fuse boxes.
• Radio/Infotainment System Dead: If your radio or infotainment screen is completely unresponsive, check the "Radio" or "Infotainment" fuse in the passenger compartment fuse box. Before replacing, ensure there isn't a loose connection or a software glitch (sometimes a system reset can help).
• Headlights Out (one side): If only one headlight is out and the bulb is confirmed good, check the individual fuses for the "Headlights (Low Beam)" or "Headlights (High Beam)" in the under-hood fuse box. If both are out, it might be a relay or a more widespread issue.
• Blower Motor Not Working: If the fan for your HVAC system isn't blowing at any speed, check the "Blower Motor" fuse in the under-hood fuse box. A failing blower motor resistor can also cause this problem, sometimes leading to the fuse blowing.
• Trailer Lights Malfunctioning: If your trailer lights aren't working correctly, inspect the "Trailer Tow Lamps" and "Trailer Brake Feed" fuses, which are likely in the rear or under-hood fuse boxes. Ensure the trailer wiring harness is properly connected and free of corrosion.

Always verify the printed legend in the fuse box lid against what is published here, as trim levels and manufacturing changes can lead to slight variations. When in doubt, consult your owner's manual for the most accurate and up-to-date information for your specific 2022 Ford F-350 Super Duty.

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