2020 Mercedes-Benz Sprinter Fuse Box Diagram & Amperage

Quick Answer

The 2020 Mercedes-Benz Sprinter features several fuse boxes distributed throughout the vehicle to protect its various electrical systems. You'll find fuse boxes located under the hood, under the driver's side dashboard (kick panel), and in the cargo area/under the passenger seat depending on the specific trim and configuration.

Under-Hood Fuse Box

The under-hood fuse box, typically located near the battery or on the driver's side, houses fuses and relays for critical engine components, starter, and other high-current systems. Always refer to the fuse diagram in your owner's manual or on the fuse box lid for the exact layout pertaining to your vehicle.

Driver's Side Dashboard (Kick Panel) Fuse Box

This fuse box is usually found behind a removable panel on the driver's side of the dashboard, often near the footwell or door sill. It typically contains fuses for interior accessories, lighting, and convenience features.

Cargo Area / Passenger Seat Fuse Box

Depending on your Sprinter's configuration (e.g., Cargo Van, Passenger Van, different wheelbase), an additional fuse box might be located in the cargo area, often behind a trim panel, or under the passenger seat. This box often handles circuits for rear accessories, power outlets, and in some cases, trailer connections.

How to Test a Fuse

Testing a fuse is a straightforward process that can help you diagnose electrical issues. Here's how:

1. Locate the fuse box: Refer to your owner's manual for the precise location of the fuse box you need to check.
2. Identify the suspected fuse: Use the diagram on the fuse box lid or in your manual to find the fuse for the circuit that isn't working.
3. Visual inspection: A blown fuse will often have a broken wire or a dark, burnt appearance inside. Many modern fuses are clear, making this easier.
4. Use a fuse tester or multimeter (recommended):
   • Fuse Tester: These inexpensive tools light up if the fuse is good. Simply touch the probes to the test points on top of the fuse (or remove it and place it in the tester).
   • Multimeter: Set your multimeter to the continuity or ohms setting. Remove the suspected fuse from its slot. Touch the multimeter probes to each metal tab of the fuse. If the multimeter beeps or shows a reading close to zero ohms, the fuse is good. If it shows "OL" (open loop) or no reading, the fuse is blown and needs replacement.
5. Replace with the correct fuse: Always replace a blown fuse with a new fuse of the exact same amperage (amp 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 all fuses can potentially blow, some circuits are more prone to issues due to their high usage or connection to common accessories. For the 2020 Mercedes-Benz Sprinter, common blown fuses might include:

• Cigar Lighter / 12V Outlets: These fuses often blow due to overloads from charging multiple devices or using high-power accessories. If your 12V outlets aren't working, check the corresponding fuse in the dash kick panel fuse box.
• Blower Motor: If your HVAC fan isn't working on any speed, the blower motor fuse (located in the dash kick panel) is a good place to start. Issues with the blower motor resistor can also cause this fuse to blow.
• Trailer Brake/Towing Fuses: If you experience issues with your trailer lights or brake controller, check the fuses in the cargo area/passenger seat fuse box first. These circuits are often under significant load.
• Headlight Fuses: While less common, a short in a headlight circuit or a faulty bulb can sometimes lead to a blown headlight fuse. If one of your headlights is out, verify the bulb first, then check the fuse in the under-hood fuse box.

Always check the easiest things first: Before diving deep into diagnostics, ensure the problematic component (e.g., a device plugged into a 12V outlet) isn't the cause. If a fuse blows immediately after replacement, there's likely a short circuit in the wiring or the component itself that needs professional attention.

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