The radio/ stereo wont work
Its usually a red or black. You can buy an inexpensive tester to find a live circuit or make your own. Get and 12V bulb and 2 lengths of 16 or 18 gauge wire. Solder one wire to the center contact of the bulb, the other to the metal case of the bulb. Cover the case and exposed solder joints etc with electrical tape. Turn on the radio. Attach the case (ground wire) from the bulb to any metal in the car, use the other (positive end attached to the bulb) as a probe. Probe each plug going into the radio, when the bulb lights, you found a hot circuit.
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