78 280se - Wacky headlamp issue - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 10-09-2012, 04:42 PM Thread Starter
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78 280se - Wacky headlamp issue

Hi all, Just picked up a 280se. Recently noticed the low beam appeared to be blown. I checked the high beams and turns out with the high beams on, all low and high beams illuminate. I checked for loose connections but there is nothing apparently loose. Does this bulb possibly have 2 filaments? And one is blown?

I've never troubleshooted an issue like this so any advice would really help!
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post #2 of 3 (permalink) Old 10-10-2012, 10:01 AM
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Vehicle: '70 280S-'73 450SLC-'81 380SL-'84 500SEC Euro-'92 300SL24-'95 E320
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I have a '70 280S that I recently finished refurbishing. I had all kinds of weird lighting gremlins and tried everything I could think of including bowing to the East under a full moon. What solved all the problem was embarassingly simple. There is a small ground strap that attaches to the radiator frame and goes to the block. I removed and cleaned it. More importantly, I cleaned the hell out of both mounting points until I could see fresh clean metal. I reattached the strap and everything came back including my sidemarker lights. Hope this helps, good luck either way.

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post #3 of 3 (permalink) Old 10-11-2012, 05:15 PM
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I just dealt with a similar issue and it was a ground for me too. My issue was the ground came disconnected inside the connector plug itself, so I had to go at it from the back with a small awl to pry the metal tab forward a bit while pushing it free from the front side. Once it was out I could better see what was connected and what wasn't. You may still want to try cleaning the grounds you can see first since it's a lot easier, but if you still don't solve the problem try the cleaning the connector route.


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