The previous owner did a hack job like most with the trailer wiring, that and a bad connector it kept spitting the trailer side out. He used all red wires for his wiring and the old plug is so corroded I wasn't able to take it apart and switch wires over. He had run two wires from the front of the truck ones connected to power the other to ground I wired them as aux and ground.
So right now this is how I have it wired.
brn/grn -as- RT wire
blk/yel -as- tail lights
purple/black -as- reverse(no switch in trans but its there)
and then one wire for LT
I think i may have connected a terminal at the plug wrong as I don't have any of those, hazards don't work and neither do tail lights/brake lights. However when I hit the brakes the controller goes to direct voltage( 11.5v), with the running lights on it is saying 1.2 v
I am not sure where to tap into the harness for the trailer brakes.