Originally Posted by BAB
Yup, for around $130 (as I recall) this was a factory installed option. 5 lit-up switches just to the right of my trailer controller. From looking at the plug in the back (after popping off the radio/stack cover) I could see they are plugged in...but no clue as to where the wires terminate. I am fine with them going to ground, as I understand relay installation, etc. Would have been nice if RAM had provided some kind of clue as to if/where there's a power distribution box, etc. I'll go to dealer tomorrow. I am prepared to have them not know either.
There's a full documentation on the RAM bodybuilders site. If they came in your truck there's a full wiring harness included.
Basically there are 2 4pin plugs right in front of the driver under the hood. You get an output for each switch and a ground. They have their own relay/fuse box mounted in the same location.