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On German cars, Brown is alway the ground wire, b (archive)

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Posted by Rainman on October 11, 2001 at 07:50:23:

In Reply to: My solution might be yours too. posted by Rusty on October 11, 2001 at 06:04:58:

Brown, earth, ground, get it....
On my '88 735il, there is a gray/black wire coupled with a red/white wire in a two prong socket. (The original BMW radio had a yellow wire and a white wire connected to a male plug that plugged into this socket.) The red/white wire is the hot battery wire and the gray/black wire is the radio controls background lighting electrical source. I thought the gray/black wire was a ground so I doubled it to my other ground. This grounded out all of my instrument lighting. After I undid this and taped the gray/black wire off, lights work fine. Good luck.

'88 735il
'90 325 is

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