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Looks like gray/black is the hot wire to the radio (archive)

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Posted by Rainman on October 10, 2001 at 08:16:09:

In Reply to: Here is your schematic, the source C is the posted by Rainman on October 10, 2001 at 08:12:05:


power supply from fuse f6 to the light switch, then to the dimmer and from the dimmer its where you see here.

Just a thought...could it be that the dimmer wire from the original radio has to be connected or the entire circuit won't work? I know that the original radio dims with the panel lights, and aftermarket units usually do not.

Good point. Any idea which wire controls the dimmer/background lighting function for the stereo? There are 2 POS wires (1 for the ignition ACC function and 1 for the battery) and what appears to be a NEG wire for each). Since the aftermarket radio only had one NEG wire, I ran both of the car's NEG wires to the one stereo NEG wire. It could be that one of car's NEG wires was actually a wire for the background lighting for the BWM stereo. Any thoughts?

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