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Purchased a new trailer wire harness today and plugged it in to factory connections. Does not work, checked fusses and checked dc voltage at new harness.
HELP
 

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What do you mean factory wiring harness? It is a harness that goes under the hood, in the cab and under the truck to the bumper.
If you mean the 7 pin pigtail, it goes to 2 connectors under the left side of the bed. It will only work in 7 pin mode if you have wires coming out of both connectors on the truck side
 
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