Mercedes-Benz Headlight Fuse Keep Blowing, New Bulb
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, which didn’t fix the problem.
Upon further diagnostics, we found that the headlight fuse kept blowing when you turned on the ignition or the headlight. Since most Mercedes vehicles have auto lights, the fuse will blow as the lights turn on automatically.
How to Troubleshoot Mercedes-Benz Headlight Fuse Keep Blowing
Solution
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, partly because the insulation gets damaged.
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.
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 have 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
