partsman01ExplorerApr 02, 2015Question Wiring question GMC 2003 2500HDSo bought this GMC and it has a 7 pin plug under rear bumper, previous owner never had a brake controller installed, so have no idea if he ever used it, but also found a wire harness by drivers side b...Show More
shadoowExplorerApr 02, 2015this link may help. It's a pdf download describing electrical information for 2003 and later chev/gmc trucks
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