W211 AMG Discuss the W211 AMG's such as the E55 and the E63
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Old Feb 23, 2010 | 06:40 PM
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lightningfast7's Avatar
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2005 E55
Third brake light problems

I'm about to tear this damn car apart.. I just replaced the 3rd brake light (only because of a couple dead LED's) back in November and last week the 3rd Brake light warning light came on.. i figured the new part just went bad.. Definitely not.. put the old one back in and still nothing.. checked the fuse and it's good. I have 2.5 volts at the hot side of the fuse, but only millivolts at the 3rd brake light connector. Tried following the wire as much as i could and didnt see any breaks in the wire. Tried to do a continuity check and the multimeter would beep like there was continuity, but it still showed overload.. wtf?

Does anybody have the schematics of the 3rd brake light? Is there a relay that it goes through?!? Everything else is working perfect, but this is about to drive me crazy..
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Old Feb 23, 2010 | 06:45 PM
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'71 Pinto
https://mbworld.org/forums/3694210-post1.html
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Old Feb 23, 2010 | 07:48 PM
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Haha I have no idea how I looked over that section. Got it fixed. Thanks a lot.. You saved my sanity.
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Old Feb 23, 2010 | 09:52 PM
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2019 S63
I just had mine replaced at the dealer too. The gasket around the 3rd brake light was bad and letting water in..shorted the LEDs on side.
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Old Feb 23, 2010 | 11:47 PM
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Originally Posted by konigstiger

Excellent resource!
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