Have you double checked the controller's manual to be sure you're testing correctly? Is the voltage going to the brakes readable on your controller?
If so, try putting the TV in neutral and apply the brakes manually. Remeber you're trying to stop an 8,000 lb. trailer.
Wright and Penny
2010 Tundra 4X4 5.7L V8
2014 Rockwood 2604WS
Life is a cruel teacher. She gives the test first; the lesson then follows.