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Check the wiring harness behind the rear seat (archive)
[ Follow Ups ] [ 3-series (E21) Message Board ] [ Msg. Board FAQ ]
Posted by Keith R. on September 21, 2001 at 06:37:55:

In Reply to: Help! Brake lights out!! Again!! posted by Ben on September 20, 2001 at 21:21:17:

I was having nightmare issues with my rear lighting blowing fuses. The problem turned out to be chafed/shorted wiring. In my '77 (and I assume all E21s) the rear wiring harness passes down the driver's side of the car and up behind the driver's side of the rear seat. The combination of the rear seat and any rust in the rear wheel well area will likely chafe through the wiring harness. If you get a chance to remove the rear seat you might find the problem area. Good luck!

Keith

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