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Waynem, I have an '05 F-350. I have the same problem. I called the dealer and was told that the built in controller didn't send power to the trailer unless you were doing at least 15 mph. My solution was that I ran a wire from a hot 12v to a momentary on switch,then to the output brake wire from the controller. That way I can do a pull test,or hold it on a hill if needed. Bill
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