My connector on the vehicle side shorted out. I realized this because My trailer brake controller was acting as if my trailer was connected and it wasn't. I disconnected the connector at the rear bumper completely and that problem went away. Found the short. Replaced the connector and the brake controller seems to be acting like normal.. unfortunately I am unable to get to my Airstream, because of the snow, just to plug it in and see if it works.
Now my question is the lead coming from the brake controller... is it supposed to have 12 volts or 0 volts all the time? Mine is reading 0.
Also I think I have another problem, my 12 volt
lead is only reading 3.9 volts with the vehicle on or off. I checked every fuse I could find and all are good.
It is an 06 GMC 1500
CC and I am using the factory wiring harness.