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Trailer battery fuse?


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Wondering if anyone knows where the trailer battery fuse (12v hot wire to 7 pin harness) is located, 2015 2500HD LTZ with trailer equipment package. In the fuse block under the hood on the diagram there is a spot labeled "trailer battery" believe it's spot #2 but there is no fuse there and no terminals to put a fuse. Tested the pin at the harness and it's getting power

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I believe that the trailer power is always on with the 15s. Mine has power at the plug. I made an adaptor so I could tap the 12v power for use in charging my RC airplane batteries at the tailgate.

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