I was thinking during this morning, you might want to remove the left-side tailight first to see if there was a splice done at the tailights. Two screws next to the tailgate are all that hold it on and you can check this without getting under the truck.
Good luck,
David

 

OK guys guess it didn't come with any trailer wiring. All wiring has casing and the dodge tape still on it. The only plug with wiring is the 4 prong at the Y and then it goes to the tail lights. Took off both tail lights and no splicing. Followed wireing all the way back to the front and no splices.
Thanks for all the help