brian a

I am having a lot of difficulty figuring out which wires are my battery and ground for the stock stereo. It is a stock Audi cassette radio from 1990 Coupe Quattro, it has a diagram stuck to the side that has symbols describing each wire. I cannot figure out which symbol is power and which one is ground. And after a lot of trial and error I couldn't figure it out by just testing each wire individually. Additionally, I can't find a diagram of the stereo input/outputs in the stereo owners manual, or my bentley manual. Does anyone know where I can find a diagram, in english, of the wires connected to the stock stereo?

Richard Solomon

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Pat Rick Wayne

It's not letting me send the photo