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I have electric brakes on my one axle car trailer-brake controller. When I use a test light-goes from green to red, when I hook up black and white wire for brakes in truck-controller light is green- do I have to ground the brakes to the trailer or off the truck? Do the wheels have to turn to activate magnetic field? Aldo there is grease in the drums, will that affect the brakes not working on the trailer?