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I need to know which wire in the reverse lights is negative. on 2006 Chevrolet Express 3500

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I am installing a rear back up camera and it requires that you wire it into the reverse lights. I need to figure out which color is negative.
(1) Answer
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Light green wire brings power to the back up light bulbs, the other wire at the bulb goes to ground , confirm using a volt/ohm meter.