The coiled large black wires go to my winch, the large dark red wire is the main buss wire for my handmade wiring harness and goes to the relay and fuse block under the hood.
The only other wires are a ground (-) going to the frame by the motor and the (+)2 red wires going to the computer and starter relay.
Maybe your dealer added a charging port? I added one to the battery side of my winch contactor under the hood as that is the closest to my battery tender when it's parked.