I would check the adjustment too.
I had happened to my trailer.

Dave

Quote Originally Posted by Keith Merrell View Post
My trailer brakes stopped working on my dump truck. The green light on the controller is on, when the trailer is connected, but when you give the tabs a squeeze to test the brakes, the red light does not come on and the brakes have no effect. What could cause this? Could it be a bad ground on the trailer end of the electric brakes?? I have been chasing my tail with this...