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  #1  
Old 11-04-2017, 12:27 PM
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Join Date: Aug 2017
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87 300SDL Left Tail Light Not Working

The left tail light on my 87 300SDL is not working. Fuse is good and has 12 volts at both sides of the fuse.
After inspecting the tail light fixture itself and finding nothing wrong I checked the plug that plugs into the fixture and found the two pins (6 and 8) for the tail light bulbs are only reading about 1.5 volts. Ground side is fine. I'm not sure where the wire goes between the fuse and the fixture to look for the problem.
Any ideas or similar experiences? Thanks!
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  #2  
Old 11-04-2017, 07:13 PM
Diseasel300's Avatar
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Join Date: May 2016
Posts: 6,071
Give the Bulb Indicator module in the fusebox a good hard slap. It'll be the longest module next to the brake booster. If you have bad solder joints in there, it'll prevent operation of the lamp. A good hard whack should make contact long enough to diagnose it as the problem.
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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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  #3  
Old 11-06-2017, 09:21 AM
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Thank you!

Dieseasal,
Thank you very much.
I have a gas parts car and I just switched the bulb indicator module (126 542 01 32) between the two cars and now my tail light works perfectly.
Thanks again!
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  #4  
Old 11-06-2017, 09:23 AM
Diseasel300's Avatar
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Great! Always nice when it's something easy!
__________________
Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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