Yeti plus wrote:
There is a coiled up wiring harness on the frame just behind the cab on GM trucks to install in the box of the truck for fifth wheel and truck campers. Put that into the box and hook up a 7 pole female plug to plug the camper into, and then the plug on the bumper is good to go for your boat.
On my 2014 I just popped out the plastic cap that GM put on the front wall and fed the wires through put the receptacle on the end of the wires because I couldn't bring myself to drilling a big hole in the side of the box to mount the plug into.
Brian
2014 only has 7 pole plug at bumper.
I have a 2017 GMC 3500 SLE 4X4 short box and I did exsactly what is written in this post.
I tow a snowmobile trailer with a flat 4 plug in the winter and a UTV flat deck, duel axel trailer the rest of the time, and this trailer has the 7 pole plug.
For my camper I installed the extra 7 pole female plug up front inside the box, drivers side.
The wiring harness is coiled up under the bed of the truck just waiting for you.
Soup.
