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for the power wire get a test light, but for the speakers take a AA battery connect one end to one matching wire, and the other wire to the other end of the battery, if you listen carefully you should hear feedback from the appropriate speaker, mark the wires and continue with the rest, most vehicles require a new switched power wire to be connected simply run wire from your [radio] fuse in your fuse box to the switched wire on your new deck. alternatively check at a local car stereo dealer and see if they have an adapter plug that would connect your old wiring harness to your new deck. for the power wire get a test light, but for the speakers take a AA battery connect one end to one matching wire, and the other wire to the other end of the battery, if you listen carefully you should hear feedback from the appropriate speaker, mark the wires and continue with the rest, most vehicles require a new switched power wire to be connected simply run wire from your [radio] fuse in your fuse box to the switched wire on your new deck. alternatively check at a local car stereo dealer and see if they have an adapter plug that would connect your old wiring harness to your new deck.

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Q: What is the wire diagram for a stereo in a 1989 Buick Century?
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