Elect Brake Problem

While pulling trailer to park in front of the garage to check wheel bearings as I stopped to back up I noticed the drivers side rear tire locked up when I stopped. Jacked trailer up, pulled all four tires and hubs. Found passenger side rear seal had leaked and brakes coated in grease. Replaced both rear brakes and magnets. Hooked truck to trailer, set the controller (10 month old Primus IQ) Started adjusting the brakes on the drivers side rear. Had wife pump the brakes to help set them as I adjusted. Worked great, went to the other rear wheel, did same adjustment. Brake did not work, ok, maybe broken wire inside axle, ran jumper from working wheel to opposite side, nothing again. Checked current with a circuit tester, light is dim on non-working side. Did the same adjustment to the front axle, does not work using brake pedal. Had wife push bar on controller and all brakes locked up. Am going t0 try checking entire wiring from controller to brakes today.
All help will be put to good use.

Bkick