Have you checked the fuses? I haven't got the diagram at my fingertips,
but Mercedes wouldn't be dumb enough to fuse left and right beams
together. You can't always detect a burnt fuse by eye, so put another
in to be sure. Otherwise, you've got a wire off, or a bent prong in the
I tried swapping the fuse and it didn't help.
Twice in the last several days the right headlight turned on... so the
problem is intermittent. It came on when I started the car with the high
beam switch turned on, turned on the headlights, then switched to low beams.
Suddenly both of the low beam headlights were on!!!
Is there a relay that controls the lights that may be the culprit? Any
other tips to diagnose the source of the problem?
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