Third Brake Light Repair '97 - Mercedes-Benz Forum
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post #1 of 40 (permalink) Old 01-26-2009, 04:38 AM Thread Starter
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Third Brake Light Repair '97

Third brake light repair

I failed inspection because my third brake light was out. I changed the bulb and it worked for a few days and then went out again. I took a multi-meter and tested the bulb and it was still good, so I knew the problem was with the fixture. I finally figured out how to remove the fixture and I found that one of the contacts was burned and pitted. As a temporary fix to pass inspection I cleaned the contact and bent it so it would make better contact with the base plate. I had some time today so I took everything apart and did a better job with the repair. This time I removed the bad contact and put a blob of solder on the pitted area and filed it down so that it would make a better cleaner contact with the base plate. The attached photos show some of the steps in the repair process.

Just a note. I never got any lamp out message, so I didn't know it was out until I failed inspection
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post #2 of 40 (permalink) Old 01-26-2009, 04:40 AM Thread Starter
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last 2 photos

last 2 photos for brake light repair
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post #3 of 40 (permalink) Old 01-26-2009, 04:17 PM
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With the amount of light failures in the '97, this could be a prettyyyy useful thread haha.

Nice pictures, steps seem easy enough.
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post #4 of 40 (permalink) Old 01-29-2009, 09:33 PM
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Well done. My brake light was out too. Took to Mercedez Workshop and was told that need to change the whole brake unit for a mere $780!!!! They said not the bulb fault, not the fuse problem, must be something wrong with the whole unit....... I told them not to worry, I can drive without the 3rd brake light!!!
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post #5 of 40 (permalink) Old 01-30-2009, 06:18 AM
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Wow! One of the most useful links i've found here my third brake light has been out since i bought the car and it's the first time i've seen it in it's red shiny elegant glory. Thanks to the thread author!
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post #6 of 40 (permalink) Old 01-30-2009, 07:14 AM
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very helpful. Mine works but is the space between the lens and the rear glass is really dirty. I spent a long time trying to figure out how to remove it.
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post #7 of 40 (permalink) Old 01-31-2009, 06:13 AM
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Yea kudos to the poster! I was wondering how to remove the dust from behind the lens on the glass.............Thanks!

Jeff

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post #8 of 40 (permalink) Old 01-31-2009, 03:16 PM
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Give appraisal to 97NJBenz, I was in a constant state of confusion trying to force the third brake light to work.

I've tried nearly everything from sanding the wrong electrical contacts and re-routing electrical wire from the tail light assembly to the third brake light, which resulted in blowing two fuses and my brake light switch.

Once again 97NJBenz, Thank you!

Now can someone assist me in locating a new third brake light cover? Mine was so brittle it fell apart as I placed it back, Thanks.

Ruben.
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post #9 of 40 (permalink) Old 01-31-2009, 09:00 PM Thread Starter
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Thanks for the Kudo's

Glad I was able to help some people out.

Ruben,

Quote:
Now can someone assist me in locating a new third brake light cover? Mine was so brittle it fell apart as I placed it back, Thanks.
My brake light cover also broke as I was taking it off for about the twentieth time while I was trying to figure out what was wrong with the light. I carefully super glued mine back together one section at a time.

I was not able to find a new cover and any used ones that are out there are now eleven or more years old, so I have to assume that they are as dried out and brittle as what you have.

If you find any source of replacement covers let us know.

Sean

P.S. I'll have to post the repair I did on the rear window lock switch (child safety window switch)
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post #10 of 40 (permalink) Old 01-31-2009, 11:07 PM
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I had to glue mine too. I have seen used units come up here from time to time.
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