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Message: <blockquote data-quote="jsloan10" data-source="post: 908669" data-attributes="member: 560397">Take a DMM(digtal mutimeter) or a 12volt bulb with a wire soldered to the +and -,grab a suspected power wire and switch the ignition to the acc position.Once you have the wire that turns on with the ignition you need to find a constant power wire, an 81 chevy truck most likely doesn't have one so splice a wire into the cigarette lighter + which is live at all times (for the HU memory)Now that you have switched and constant power you need a ground, you could run a wire under the carpet and use one of the bolts holdin the seat down or a metal part of the dash.Now just run some speaker wire and your done.</blockquote>

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