Took drums off and all seems ok. Magnet and drum have little wear. Found ground by bumper and put a new end on. Tested voltage at 7pin. Tried brakes by pulling break away cable. Adjusted star wheel. Still brakes won't even hold me on a slight hill. Checked ground on brake controller. All looks good. What next. Since I had drums off I put new seals and bearings also. I'm at a loss now.