Sounds like faulty brake controller...
Alt too much voltage??? LOL... ha ha ha.. Thats a good one... Like a left handed wrench....
Mike L ... N.J.
2006 Silverado ext cab long bed. 3:42 rear. LM7 5.3 motor. 300 hp 350 ft lbs torgue @ 4000 rpms
2018 coachmen Catalina sbx 261bh