First, I would return that BC and have Amazon replace it with an unopened box. I would open your underhood fuse box and check all fuses associated with the trailer connector, sometimes 2-4 fuses. I would suspect trailer end short, which would blow truck fuses when you plug in the 7 way. I know, I did it. Trailer was hooked up to shore power when I plugged the 7 way in and blew the truck fuses from the back feed. One other thing to check on the trailer for a short which is very common, is where the brake wires run thru the axle tube from one side to the other, sometimes the wire gets chafed from rubbing on the steel axle tube, thus causing a short. You can just run a new wire outside of the axle tube, to rule that out.
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2016 Starcraft AR One 18QB
2016 Colorado LT 3.6L V6 Ext. Cab
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