2020 Ford Transit - Fuse Box Diagram & Amperage

Quick Answer

The 2020 Ford Transit features multiple fuse box locations to protect its electrical systems. You'll find fuse boxes under the hood, behind the glove compartment on the passenger side, and in the cargo area (for certain configurations).

Under-Hood Fuse Box (Battery Junction Box)

The under-hood fuse box, also known as the Battery Junction Box (BJB), is located in the engine compartment on the driver's side, near the battery. It houses high-current fuses and relays for major components like the engine control module, fuel pump, cooling fan, and various other essential systems. Always refer to the fuse diagram on the inside of your fuse box lid for the most accurate information, as configurations can vary slightly by trim and options.

Relay Locations (Under-Hood):

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

Passenger Compartment Fuse Box (Smart Junction Box)

The passenger compartment fuse box, also known as the Smart Junction Box (SJB), is located behind the glove compartment on the passenger side. To access it, you will typically need to open or remove the glove box. This fuse box controls many of the interior and accessory circuits.

Rear Cargo Area Fuse Box (Auxiliary Fuse Panel)

Some 2020 Ford Transit models, especially those with certain upfit packages or rear air conditioning, may have an auxiliary fuse panel located in the cargo area, often on the driver's side lower panel. This panel typically protects additional accessories and rear-specific components.

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 located in one of the fuse boxes) and a multimeter or a fuse test light.

1. Locate the suspected fuse: Refer to the fuse box diagrams above and your vehicle's owner's manual or the fuse box lid for the exact location of the fuse you want to test.
2. Turn off the ignition: Ensure the vehicle's ignition is off to prevent electrical shock or damage.
3. Remove the fuse: Use the fuse puller to carefully extract the fuse from its slot.
4. Visually inspect: Hold the fuse up to a light and look at the wire inside. If the wire 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 continuity setting (often indicated by a speaker or diode symbol).
   • Touch one probe to each metal blade of the fuse.
   • If the multimeter beeps or displays a reading close to zero ohms, the fuse is good. If there is no beep or an "OL" (open loop) reading, the fuse is blown.
6. Test with a fuse test light:
   • Connect the test light's clip to a good ground point on the vehicle.
   • Touch the probe to the small metal test points on the top of the fuse while it's still in the fuse box and the ignition is on (or the circuit is active).
   • If the test light illuminates on both test points, the fuse is good. If it only illuminates on one side or not at all, the fuse is blown.
7. Replace the fuse: If the fuse is blown, replace it with a new fuse of the exact same amperage rating and type. Never use a fuse with a higher amperage rating, as this can cause serious damage to your vehicle's electrical system or even lead to a fire.

Common Blown Fuses on This Vehicle

While fuses can blow for various reasons, some circuits are prone to experiencing issues more often due to their usage or the components they protect. On a 2020 Ford Transit, common fuses that might blow include:

• Cigar Lighter/12V Outlets (Passenger Compartment Fuse Box, F18): These often blow due to overloading from charging multiple devices or using high-power accessories. If this fuse blows, first check any devices plugged into the outlets and remove them before replacing the fuse.
• Radio/Infotainment System (Passenger Compartment Fuse Box, F1): Issues with the radio or connected accessories can sometimes lead to this fuse blowing. If your radio suddenly stops working, this is a good first check.
• Blower Motor (Under-Hood Fuse Box, F3 or Passenger Compartment Fuse Box, F7 for rear): A failing blower motor or an obstruction in the blower motor fan can cause these fuses to blow due to excessive current draw. If your HVAC fan isn't working, check these fuses.
• Headlights/Tail Lights (Under-Hood F6, F7, F8, F9, Passenger Compartment F11, F12): A short in the wiring or a faulty bulb (though less common for a full circuit fuse to blow from one bulb) can cause these fuses to blow. If a section of your exterior lighting goes out, these are the fuses to check.
• Trailer Brake Controller (Under-Hood Fuse Box, F15): If you're experiencing issues with your trailer brakes, this fuse is a primary suspect, especially after connecting a new trailer or if there's a short in the trailer's wiring.

Always remember to check what was in use or what recent work was done on the vehicle when a fuse blows, as this can often give a clue to the root cause. If a fuse repeatedly blows after replacement, there's likely a short circuit or a faulty component that needs professional diagnosis.

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