SL/R129: No Power to Headlight
12-05-2007, 04:28 PM
#1
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1991 500sl
No Power to Headlight
Hi guys, i have a bit of an issue.
My right side headlight on my 1991 500sl does not work. This is an OEM Mercedes HID system. I originally thought that the ballast was bad, so i swapped the right side ballast to the left side to see if the fault would follow. The ballast worked fine. Next i removed the entire right side headlight assembly and hooked it up the the left side connections, the headlight housing worked fine too, the projector lamp turned on. So, next i measured the voltage coming from the right side headlight power connection and there is NO Voltage.
I need to trace the headlamp power back to it's origin, does any one know if there are independent fuses or relays for the HID headlight system?? Or some kind of control module that powers the lights separately? I'm not quite sure where to take things from here.
Thanks
Oh one more thing, the high beams work on both sides, it's just the HID projector that does not work on the right side.
My right side headlight on my 1991 500sl does not work. This is an OEM Mercedes HID system. I originally thought that the ballast was bad, so i swapped the right side ballast to the left side to see if the fault would follow. The ballast worked fine. Next i removed the entire right side headlight assembly and hooked it up the the left side connections, the headlight housing worked fine too, the projector lamp turned on. So, next i measured the voltage coming from the right side headlight power connection and there is NO Voltage.
I need to trace the headlamp power back to it's origin, does any one know if there are independent fuses or relays for the HID headlight system?? Or some kind of control module that powers the lights separately? I'm not quite sure where to take things from here.
Thanks
Oh one more thing, the high beams work on both sides, it's just the HID projector that does not work on the right side.
12-07-2007, 08:08 AM
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SL 280, 1994
When you stand in the front of the car. Under the hood up in the right corner you will find the fuse-and realybox. (Least is it so on the eutopean models) Under the fusecover you will find number and where the fuses work
You also have an additional fusebox in the trunk, but his box has nothing with the lights to do. Central locker, IR-function is among otherts thing placed there.
Problem with SL is Galvanic corriosion on fuses in the fusebox. So start clean up every single one.
Good luck
jori
You also have an additional fusebox in the trunk, but his box has nothing with the lights to do. Central locker, IR-function is among otherts thing placed there.
Problem with SL is Galvanic corriosion on fuses in the fusebox. So start clean up every single one.
Good luck
jori
12-07-2007, 10:05 AM
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1991 500sl
Ok, thank you so much for this information. I will remove, check and clean all fuses. I also found in my search on SL forums that there seems to be a common problem with the headlight connectors getting corroded, so i will clean those too and let you all know how it works out.
12-07-2007, 07:33 PM
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1992 SL-300
The corrosion starts because it is a bi-metallic connection. In some auto stores you can find copper replacements to rid the problem.
Good Luck
Good Luck
12-11-2007, 06:44 AM
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R 129 MB 500SL
Or, if there has been a bit of corrosion at the fuses, the connecter at the bottom of the fuse can melt the plastic, and sink downwards, thus not making contact with the fuse, particularly on the fuse that lights the interior high beam idiot light.
