Timely thread on blown window fuses; my '87 420SEL has blown a few fuses. One person suggested cleaning the window switches, another thought replacing the relay might solve the problem.

Every time the fuse blew, I simply replaced it with the same color as what was there when I bought the vehicle. Tonight, looking at the post with the fuse location and size, I realized that mine had too small a fuse (white 8 amp) installed and actually needed a blue 25 amp fuse. I'll see how it turns out, but I'm sure that's why the fuse would blow once a week. Guess I should always start with the obvious... and I was ready to pull and replace all the window switches.

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Richard / E320

2001 E320
1987 420SEL