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Auto parts stores can sell you a trailer harness that plugs in between your existing truck harness. The electrical connection used is usually located behind the rear bumper on the inside of the left frame. Directions will come with the trailer harness kit.

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โˆ™ 2014-02-09 14:22:09
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Q: Where is the wiring harness to hook up trailer lights on a 1990 Chevy G20?
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