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1990 325i alpine stereo wiring

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    1990 325i alpine stereo wiring

    I've been trying to figure this out but for the life of me I can't. There's a problem with my stereo. I think someone put in an amp or something in the car previously because the wiring seems pretty beat up.

    I got the security code for the radio and the unit turns on and works, but 5 out of the 6 speakers do not play sound. All I hear is this weird fuzzy noise and heart beat sounds. I tried swapping the speaker I know that's good around and it didn't work any where's else. So something's wrong with the wiring. Does anyone know what connectors go to which speakers? My car doesn't have an amp and I don't think there's a fader what ever that is.

    Also there's this yellow wire that goes near the stereo that's been cut. I don't really think it goes to the stereo but I traced it from there to under the steering wheel. Anyone know what it would be? It's just a single yellow wire.
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