2023 Ford F-250 Super Duty Fuse Box Diagram & Amperage

Quick Answer

The 2023 Ford F-250 Super Duty features three primary fuse box locations to manage its extensive electrical systems: the Power Distribution Box (under-hood), the Smart Junction Box (SJB) located behind the passenger kick panel, and the Battery Junction Box mounted to the battery.

Power Distribution Box (Under-Hood)

The Power Distribution Box, located in the engine compartment near the battery, houses high-current fuses and relays for critical vehicle systems such as the powertrain control module (PCM), fuel pump, engine lights, and trailer brake controller.

Note: Fuse configurations may vary slightly depending on your F-250's trim level and optional equipment. Always consult the fuse diagram printed on the inside of your fuse box cover for the most accurate information.

Smart Junction Box (SJB) (Passenger Kick Panel)

The Smart Junction Box (SJB) is situated behind the passenger kick panel inside the cabin. This fuse box manages many interior electrical components, including the radio, infotainment system, power windows, wipers, and interior lighting.

Note: Always verify the printed legend on the fuse box lid for your specific vehicle configuration.

Battery Junction Box (Trunk/Cargo Area — N/A for F-250 Super Duty)

For the 2023 Ford F-250 Super Duty, there is no fuse box located in the trunk or cargo area. Heavy-duty trucks like the F-250 typically consolidate major electrical components in the under-hood Power Distribution Box and a cabin-mounted Smart Junction Box.

How to Test a Fuse

Testing a fuse is a straightforward process that can help you diagnose electrical issues. You'll need a multimeter or a dedicated fuse tester.

1. Locate the fuse box: Refer to the "Quick Answer" section to find the relevant fuse box.
2. Identify the suspected fuse: Consult your vehicle's fuse diagram (usually on the inside of the fuse box cover) to find the fuse associated with the component or circuit that is not working.
3. Remove the fuse: Use a fuse puller (often included in the fuse box or tool kit) or a pair of needle-nose pliers to carefully remove the fuse.
4. Visually inspect the fuse: Hold the fuse up to the light. If the metal wire or filament inside is broken or melted, the fuse is blown and needs to be replaced.
5. Test with a multimeter (optional but recommended):
   • Set your multimeter to the "ohms" or continuity setting.
   • Touch one probe to each metal blade of the fuse.
   • If the multimeter displays "0" ohms or beeps (for continuity), the fuse is good.
   • If the multimeter displays "OL" (open loop) or no reading, the fuse is blown.
6. Replace the 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 circuits are more prone to issues due to their high usage or connection to common accessories.

• Cigar Lighter/12V Outlets (Fuse 22, 23 in SJB): These fuses often blow due to overcurrent from charging multiple devices or using high-power accessories. If your 12V outlets aren