Is your Mercedes-Benz light not working even if you installed a new one? Learn how to fix the problem by following the procedures below.

Mercedes-Benz R-Class had a problem with one of the low beams not working. The owner installed a new light bulb, but that didn’t fix the problem.

Upon further diagnostics, we found that the headlight fuse kept blowing when you either turned on the ignition or turned on the headlight. Since most Mercedes vehicles have auto lights, the fuse will blow as the lights turn on automatically.


The problem can be the wires inside the headlight assembly. The wires may overheat. Eventually, the insulation cranks and comes off.

The problem is that these wires get too hot, which is partly why the insulation gets damaged.

damaged dry roten wires headlight

Once the wires are exposed, they are short, which causes the headlight fuse to keep blowing.

A temporary solution is to insulate the wires. While this may work, it is not the ideal solution.

repair mercedes low beam not working

Ideally, you want to replace the wire harness, which requires removing the headlight unit and may even require removing the lens from the headlight.

If you are having problems with your Mercedes-Benz headlight not working after replacing the bulb, check the connector to the headlight assembly.

If the connector is not damaged or corroded and you know the bulb is new other possible issues may be:

  • damaged wire harness
  • defective headlight switch
  • faulty SAM module

We hope you find the Mercedes-Benz Headlight Fuse Keep Blowing, New Bulb guide helpful. Check these troubleshooting and repair guides for more help on your Mercedes-Benz.

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