2022 Ford F-250 Super Duty Fuse Box Diagram & Amperage

Quick Answer

The 2022 Ford F-250 Super Duty typically has three main fuse box locations: the Power Distribution Box (PDB) under the hood, the Smart Junction Box (SJB) behind the passenger side kick panel, and an auxiliary fuse panel located under the rear seat on the driver's side for specific accessories.

Power Distribution Box (Under-Hood Fuse Box)

The Power Distribution Box (PDB) is located in the engine compartment, on the driver's side, near the battery. It contains high-current fuses and relays for critical engine functions and major electrical components. Always refer to the fuse legend inside the fuse box lid for the most accurate information for your specific trim level.

Relay Locations (PDB):

• R1: Fuel Pump Relay
• R2: Starter Relay
• R3: PCM Relay
• R4: Cooling Fan Relay
• R5: Horn Relay
• R6: Blower Motor Relay

Smart Junction Box (SJB) (Passenger Side Kick Panel)

The Smart Junction Box (SJB) is located behind the passenger side kick panel, next to the glove box. This fuse box handles fuses and relays for various interior electrical components, accessories, and some body control functions. Always consult your owner's manual and the fuse legend for exact fuse assignments.

Relay Locations (SJB):

• R7: Accessory Delay Relay
• R8: Interior Lamp Relay

Auxiliary Fuse Panel (Under Rear Seat - Driver's Side)

Some 2022 Ford F-250 Super Duty models, particularly those with specific options or the Upfitter Switch system, may have an auxiliary fuse panel located under the driver's side rear seat. This panel typically provides power to factory-installed accessories or circuits designed for aftermarket upfitting. Consult your owner's manual for its exact location and fuse details.

How to Test a Fuse

Testing a fuse is a straightforward process that can help diagnose electrical issues. You will need a fuse puller (usually found in one of the fuse boxes) and a multimeter or a fuse tester.

1. Locate the Fuse: Identify the suspect fuse using the diagrams above and your vehicle's fuse box legend.
2. Turn Off the Vehicle: Ensure the ignition is off and all accessories are de-energized to prevent electrical shock or damage.
3. Remove the Fuse: Use the fuse puller to carefully remove the fuse from its slot. Be gentle to avoid breaking the fuse or its contacts.
4. Visual Inspection: Hold the fuse up to a light and look at the small wire inside. If the wire is broken or melted, the fuse is blown and needs replacement.
5. Test with a Multimeter (for non-obvious blows):
   • Set your multimeter to the continuity setting (usually indicated by a speaker symbol or ohms symbol).
   • Touch one probe to each metal blade of the fuse.
   • If the multimeter beeps or shows a reading of "0" or close to "0" ohms, the fuse is good. If it shows "OL" (open loop) or no reading, the fuse is blown.
6. Replace if Blown: Always replace a blown fuse with a new one of the exact same amperage rating and type. Using a fuse with a higher 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 exposure to specific conditions. On the 2022 Ford F-250 Super Duty, common blown fuses often include:

• Cigarette Lighter / 12V Power Outlets (F22, F23, F41): These frequently blow due to overloading from charging multiple devices or using high-power accessories. Always check these first if your charging ports are not working.
• Trailer Brake Controller (F14): Issues with trailer wiring, short circuits in the trailer, or overloading can cause this fuse to blow. If your trailer brakes are not functioning, this is a prime suspect.
• Blower Motor (F11): A faulty blower motor or a clog in the HVAC system forcing the motor to work harder can cause this fuse to pop, leading to no heat or AC fan. If your fan isn't moving air, start here.
• Headlights (F5-F8): While less common, a short in the headlight assembly or wiring can cause these fuses to blow. If one or both headlights are out, check these fuses.
• Upfitter Switches (F36-F39): If you have aftermarket accessories connected to your upfitter switches and they stop working, check the corresponding fuse in the auxiliary panel. Overloading the circuit is a common cause.

What to Check First: Before assuming a blown fuse, always check the associated component or circuit. For instance, if a headlight is out, first check the bulb. If a 12V outlet isn't working, try a different device. This can help prevent unnecessary fuse replacements.

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