Hey guys, on my 1989 300SEL, i've had nothing but problems with my left headlight. About a month ago, the headlight went out, I figured ok, just need a replacement. Threw the replacement in, still nothing. I tried flicking on my high beams, and if my high beams were on, the light lit up. I'm like ok, what's the deal. I pull out the bulb again and examine the socket to find out that the socket had melted where the low beam current made contact with the light? It's a three prong socket, and one of the holes, the very left most I believe, was completely melted. So we took it in to the dealer and they replaced it with a new plastic blue socket. Things were fine until today, it went back out, and once again, only the high beam kicks the light on. The socket does not look melted, I have no clue what is wrong with it. Anyone have any ideas? Is too much current being sucked in? How can I check? I have the 2 cd W126 shop manual set, anywhere I can check in there? Anything!!!

Thanks guys/gals!

What do I look for, and if I happen to find something that controls the low beams, why would just the left side go out then? is there a seperate fuse for both sides?

Hey guys, thanks for the quick responses and help, I hate driving around with one headlight, lowers the class

Well, the light comes on that an exterior bulb is out. When i flick on the highbeams, the bulb warning light goes back out. I'm going to check the fuse box for something about it. Thanks guys, I'll get back to you if someone doesn't get back to me first

Awesome, it was a bad fuse. I should never question you guys, always on target Thanks tons, I really appreciate all of the help!

Try the fuse box.
Many Models have seperate fuses for each headlamp side
and beam....