I finally finished the trailer plug. There was no perfect spot for it, so this was the best I could do. It's at a
slight downward angle, so I drilled a small hole at the bottom, in case any water gets in, and stuffed some dielectric grease on the connectors.
This install is probably not for the faint of heart, since we had to take a sledgehammer and a length of steel to make some room behind the bumper...
Here's a picture of a 'test fit' to give you an idea of the room we were working with...
Finishing the trailer plug wiring means the backup battery / BIC panel is also finished -- the trailer power is cut when the vehicle current drops bellow 13.4V (so the trailer fridge can't suck the starter battery), and the BIC also cuts power to the trailer when the winch is switched on. The Mopar 7-pin wiring harness includes a relay for the parking lights, but I might add some additional relays on the trailer to limit current draw on the OEM wiring (for stop, turn, and backup lights).
The "
BIC also cuts power to the trailer when the winch is switched on" feature works like this: A switch is turned on inside the cab, which activates a relay in an sPod relay/fuse box under the hood, this in turn switches on a 225A continuous duty solenoid (600A peak/spike) to power the winch, and also triggers a relay on the backup-battery panel. This relay switches a ground to the trailer BIC, which cuts power to the trailer. Simple, ey?
js.