Months later finally I have a response and what the problem was, thank you guys.
Failed inspection today...I had completely forgot about all of this. I had given up after I couldn't find anything as well as a couple of the local mechanics.
Anywho, failed inspection and went looking again. Found a bundle of wires above the spare tire coming off where the trailer connections are. They were sip tied up to the drivers side break light and cut/bare ended. One of the wires had worn through and was bare wire on the frame.
My only guess is that whoever owned the truck before me had installed a camper shell. I cut it all out and heat shrinked anything I found open. Wish I'd have taken before photos.