First off do you have a brake controller in the TV? If so have you checked to see if you are getting voltage on the 5 o clock pin in the connector at the rear bumper when the manual lever is applied on the controller? If you are
getting voltage at the connector then it is time to check out the trailer wiring.
Come back after checking these items.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles