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Just put in an aftermarket radio last week. The amp speaker output wires in my car were:
Left Front Speaker: white/blue and white
Right front: blue/white and light blue
Left rear: black/yellow and yellow
Right rear: black/white and brown
Green is 12 volts all the time
I had a black wire connecting the amp chassis with the radio chassis. Also had another black wire in the amp bundle that I believe is a ground also. Of course there's also the speaker input cable that plugs into the back of the radio.
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