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I have a 1983 240D. Can anyone identify what each of the wires are that connect to the back of the stock Becker stereo with a 4-prong black connector? The wire colors are red, black, brown, and grey.
 

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I think you will find that the wire code on the power connector is:

Red = contant 12v
black/yell = switched 12v
gray = illumination 12v
Brown= ground
 
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