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08 gmc denali "aftermarket trailer power" wire

By Chris Decker
July 9, 2023 in 1999-2013 Silverado 1500 & Sierra 1500

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Chris Decker

Posted July 9, 2023

Posted July 9, 2023

I know there are 2 extra wires that can be hooked up to the fuse box. 1 gives power to charge the trailer battery and then one that has a tag that says Aftermarket trailer power. What exactly is the function of this atp wire?

I already have the charge wire connected. Just looking into setting up a trailer brake to this truck. Thanks

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