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I have a 08 f250 that I can't get my trailer brakes to work properly. I have the factory tbc in the truck. When I set gain on 10 I can get them to lock up on gravel by slamming on the brakes. When I manually slide brake control, they will lock up the trailer. Ford says it's in the trailer. I don't think so. On the instrument cluster, when trailer connected it reads tbc gain=0.0, output= I think it is something in the truck