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Continental radio install - only 4 speaker wires w/ premium sound - help?

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    Continental radio install - only 4 speaker wires w/ premium sound - help?

    Hey gentlemens, I decided on replacing my original radio/tape with a new Continental TR7412UB with blutooth from ECS Tuning, along with the VDO wiring harnesses from ECS to make things a little simpler.

    I removed my original radio, hooked up power, ground and other functions, now getting ready to hook up the speaker wires. My car has premium sound with the dash mounted fader which I removed. With very limited instruction, I was able to identify 4 wires coming out of the fader that I could use to reach all 4 speakers. Problem is, they will go trought the amp which isn't ideal.... And most importantly, I won't have any NEG (-) wires to hook up to my new head unit. I may be dumb, but how would you guys wire this considering the rear amp only seem to handle the (+) wires and no (-) wires seems to be present in the dash...

    Thanks in advance for your feedback. I haven't been able to find a clear answer so far.


    #2
    Search for StereoInstaller's thread on the $500 best stereo option. This should cover everything you need to know.

    If you want to know the how/why, get the Electrical Troubleshooting Manual (ETM). I like the 1989 325i - 325is manual because it seems relatively complete for a late model car. Download the PDF while it's still hosted!
    sigpic
    1987 - 325i Convertible Delphin Auto [SOLD], 325i Convertible Delphin Manual [SOLD]
    1989 - 325i Convertible Bronzit m30b35 swapped [SCRAPPED], 325i Sedan Alpine Auto[DD]
    1991 - 325i Coupe Laguna Manual [Project], 535i Sedan Alpine [SCRAPPED]

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