WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, and 2012 Ford F450 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Trailer And Camper Adapter (Trailer Tow Kit - Without Crew Chief) Circuit Diagram (View 9 Of 9)