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Old 08-20-2012, 10:39 PM   #4
J Knight
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Join Date: Jun 2011
Location: Baytown TX
Posts: 2,219
Re: Wiring from 74 headlights to 82 headlights

Use a test light to determine wich is hot for high then switch to low and test again, the third wire will be the ground.
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82 Chevy Silverado 350ci/TH350
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