Originally Posted by EAKlebe

I looked at the gray connector using a mirror. It looks (considering that my eyes are getting old) that it is a six pin in two rows of three connector, with only four pins in use, although there may be a fifth pin installed, or it may just be a location pin. It's hard to tell if it is an actual pin or just a plastic location pin. However, there are the proper wire colors going in. As to the factory supplied connector: I bought this truck used about four years ago, if there was such a connector it has been lost or discarded, but no matter as I ordered the wiring harness when I ordered the P3 brake controller.