Try to trace back the wire colours to the speakers and use a volt meter to check for earth, power and constant power all you need to do is earth the volt meter to the car then check for power (igniton off) thats the constant power (memory) then with igniton on check for power you might need to cycle the igniton to make sure its ignition power and last but not least switch the volt meter to ohms then check for an earth and your done!
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