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My brake controller does have a little green light the comes on when the coach is connected, as I apply the brakes it starts to turn from green to red. The harder I brake the darker red it becomes, when I let off the brake it goes back to green. When I disconnect the coach from the plug in the little green light goes out. I guess if there is no light while plugged in that would indicate there is not a complete circuit between the controller and the brakes. And as Charlie said, one will know if the trailer brakes are not working as you find yourself standing on the truck brakes.
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