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Wallace Yallup Posted on Jul 24, 2015
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MY MERCEDES BENZ C280 is blowing fuses. The brake lights weren't working. It smells like something plastic is burning. A Mechanic looked at it, he smelled the RELAY BOX, it smelled horrible.

All Brake lights are out, including the 3rd brake light. It was looked at, and determined that an Electrical specialist should look at it. He did determine that the RELAY BOX under the hood was probably no good. Fuses were blowing about 5 mins after he replaced them. Bulbs weren't blown, but the fuses for the brake lights kept blowing. Should I try a new RelayBox first? Anyone ever have this problem? I saw where one person said he ended up paying $2,000 to have it fixed. That's what my car is worth, now.

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Randy Ohler

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  • Mercedes-Benz Master 14,585 Answers
  • Posted on Jul 25, 2015
Randy Ohler
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Joined: Jun 13, 2010
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He paid for a garage to fix it. Call a salvage yard and see what you can get the box/harness for. Some boxes are hard wired with the harness. Some aren't, plug/ bolt on harness. Hard wire is a pain. they go every where. Plug in's, just check the connectors for corrosion and being melted. Take yours apart first to see what you have.

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