Mopar towing wire harness part # k6858469

[richar43]

Last month I installed this harness into my liberty, and picked up my popup camper, and discovered that I had no running lights. so today I finally got to replace the tail lights ect on the camper, and I still have no running lights. So i sat down and stated thinking, that i may not be getting juice to that pin. After testing and discovering that pin #3 in the mopar 7 pin plug, ( the running lights pin) was not receiving any juice, so I now know that it must be the relay bank in the harness, due to everything else works fine. My question for anyone is out of the relays, #4,5, or 6, does anyone know which one needs replaced, or should I just do the trail n error method?...