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Message: <blockquote data-quote="indosia" data-source="post: 66866" data-attributes="member: 543175"><p>There should be a  Yellow=power,  Black=ground,  Red= ignition and 4 pairs of speaker wire coming from the back of the head unit.     If the wires in your car are different you can test them with a multimeter.   The power wire will show +12 volts always.   The ignition wire is a switched +12 volt wire.  This wire will only show +12 volts when the key is in the ignition,  it's usually  red.   If you can't find the black ground wire just ground directly to chassis.</p></blockquote><p></p>

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