Ok, I got some info from etrailer. I think I found the factory plug for the brake controller. Can anybody tell me if it is a gray 6 pin plug located right by the emergency brake that is used? Also they tell me I should have some extra wires on my frame rail to splice into for hooking up the new 7 pin. Well the wire harness goes straight from the hitch up inside the camper, so my question is, right next to my straight 4 pin plug is a seperate round 4 pin plug with a little trailer symbol on it, does anybody know if this plug was used for braking systems on older trailers??? Just wondering if thats where my wires are that I need for the new 7 pin.