[W126 Coupe] short in brake light circuit?

[Anuj Varshney]

My guess is it's a bad ground behind the instrument cluster. The "stop 
lamp" switch and instrument cluster share a common ground. When you ground 
the brake circuit by pushing the brake pedal, the instrument cluster loses 
what's left of its ground and goes dead.

Could also be a bad fuse, if they share a common fuse (check your fuse card).

-Anuj



At 09:17 AM 5/13/2005 -0400, you wrote:

>Have you tried to swap the light-test relay with a known good one?
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>I'm talking about the one that sits behind the fuses under the hood.
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>Regards,
>Axel J. Wulff
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>
>
>>From: Jorden1965 at aol.com
>>Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
>>To: mbcoupes at mbcoupes.com
>>Subject: [W126 Coupe] short in brake light circuit?
>>Date: Thu, 12 May 2005 22:30:58 -0400
>>
>>Heres a new one for me... My 1988 SEC has developed a short.  When 
>>depressing the brake pedal, the dash gauges go dead as if the car was 
>>turned off, when releasing the brake, the gauges re-energizes and the 
>>seat belt buzzer buzzes as if the car was first started.  Ive tried 
>>isolating all the different brake lamps, but any left plugged in causes 
>>this condition.  Is is possible that there is a short to ground at the 
>>brake light switch?  Any ideas or similar experiences would be greatly 
>>appreciated.
>>The MB Coupes Website!
>>W126 SEC Mailing List
>>Postings remain property of MB Coupes, L.L.C.
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>
>The MB Coupes Website!
>W126 SEC Mailing List
>Postings remain property of MB Coupes, L.L.C.
>