2016 Ford F-250 Super Duty Fuse Box Diagram & Amperage

Quick Answer

The 2016 Ford F-250 Super Duty typically has fuse boxes located in three primary areas: under the hood (Power Distribution Box), inside the cabin on the passenger-side kick panel (Smart Junction Box), and in the rear for specific accessories or trailer functions (though less common for a full fuse box on this model year, specific trailer relays might be present, consult your owner's manual).

Under-Hood Power Distribution Box

The Power Distribution Box is located in the engine compartment, usually near the battery on the driver's side. It contains high-current fuses and relays for major electrical components.

Relay Locations (Under-Hood Power Distribution Box):

• R1: Starter Relay
• R2: Fuel Pump Relay
• R3: PCM Relay
• R4: Blower Motor Relay
• R5: A/C Clutch Relay
• R6: Horn Relay
• R7: Headlamp (High Beam) Relay
• R8: Headlamp (Low Beam) Relay
• R9: Trailer Tow park lamp Relay
• R10: Trailer Tow stop/turn lamp Relay

Smart Junction Box (Passenger Side Kick Panel)

The Smart Junction Box (SJB) is located behind the passenger-side kick panel, often requiring the removal of a trim panel for access. This box manages many of the vehicle's interior electrical functions and accessories.

Relay Locations (Smart Junction Box):

• R1: Accessory Delay Relay
• R2: Power Window Relay
• R3: Interior Lamp Relay

Trailer Brake Control Module (Specific Relay/Fuse location)

While not a full fuse box, the 2016 F-250 Super Duty utilizes dedicated fuses and relays for its integrated trailer brake controller. These are typically found within the under-hood Power Distribution Box, as noted above, or sometimes in a separate, smaller auxiliary box near the battery or firewall.

• Fuse 2 (Under-Hood): 20A Yellow - Trailer Brake Control Module
• Fuse 15 (Under-Hood): 25A Clear - Trailer Tow Battery Charge (Always refer to your owner's manual for the exact locations and ratings for your specific truck's trim and options, as variations can occur.)

How to Test a Fuse

Testing a fuse is a straightforward process:

1. Safety First: Ensure the ignition is off and the vehicle is in park with the parking brake engaged.
2. Locate the Fuse Box: Refer to your owner's manual or the quick answer section above to find the correct fuse box.
3. Identify the Suspect Fuse: Look at the fuse box diagram to find the fuse for the component that isn't working.
4. Visual Inspection: Pull the fuse straight out using a fuse puller (often found in the fuse box lid or with the vehicle's tools). Hold it up to the light. If the metal wire or strip inside is broken or melted, the fuse is blown and needs replacement.
5. Use a Multimeter (for a more accurate test):
   • Set your multimeter to the continuity setting (usually indicated by a speaker or diode symbol). Alternatively, use the ohms setting.
   • Touch the multimeter probes to each metal tab on top of the fuse (or the two metal contacts if removed). If you hear a beep or the multimeter reads very close to zero ohms, the fuse is good. If there's no beep or it reads "OL" (Open Line), the fuse is blown.
6. Replace with Correct Rating: Always replace a blown fuse with a new fuse 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, some are more commonly encountered on the 2016 Ford F-250 Super Duty due to the demand on their circuits or common accessory usage:

• Cigar Lighter / 12V Power Outlets (SJB Fuse 3 & 4): These fuses commonly blow due to overloads from charging multiple devices or using high-power accessories. Always ensure accessories are within the fuse's amperage limit.
• Trailer Brake Control Module (Under-Hood Fuse 2): Issues with trailer wiring or a short in a trailer's electrical system can cause this fuse to blow.
• Blower Motor (Under-Hood Fuse 4): A failing blower motor, a clogged cabin air filter, or an obstruction in the blower fan can cause the motor to draw too much current and blow its fuse.
• Radio/Infotainment (SJB Fuse 1): Although less common, issues with aftermarket installations or a short within the radio unit itself can blow this fuse.
• Headlights (Under-Hood Fuses 9-12): A short in the headlight wiring or a faulty bulb can lead to these fuses blowing.

What to check first: If a related component stops working, always check the corresponding fuse first. If the fuse is blown, inspect the circuit for visible signs of damage, frayed wires, or shorts before replacing the fuse. If a new fuse blows immediately, there's a direct short in the circuit that needs professional diagnosis.

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