I just bought a new trailer with brakes. I got an addapter so the trailer would plug in to the truck. But the brakes dont work and all my lights are going crazy. I talked to this trailer guy and he said that they make two different adapters for it. The adapter goes from a 7 to a 6. Also when i put the fuse in the the brakes the brakes stay locked up. Has anyone else had this problem? My truck is a 2000 Chevy.