I'm trying to wire in a factory BMW radio (the model with the slider control) and could use some help figuring out a few wires. The plugs in my 1990 M3 are long gone, so everything has to be spliced in. I have identified the tabs for speaker's, main power, and Ground. What I need to find is the "always hot" wire. In the pic there are 4 wires coming out, yellow, white, white/brwn, blue/brwn. Any idea what they are?
Thanks!
Thanks!
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