HappyOne
Silver Member
Today I was trying to figure why my trailer brakes are not working. When I activate the brake controller, I get a sound like the magnet is being energized at each wheel but no braking. I took the brakes apart and everything looks good and moves like it should. I repacked the bearings and put it back together. I started working my way forward, and noticed there is a constant 12 volts on the trailer brake pin when disconnected. I checked the back of my trailer brake controller and it too shows 12V full time. Is having voltage constantly on the blue wire is normal. This is even with the key off.