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Old 01-25-2009, 10:15 PM   #1
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Electrical Dilemma - brake controller wiring at disconnect

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.

Any thoughts.

Thank you
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Old 01-25-2009, 10:21 PM   #2
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Hi,

The terminal coming from the brake controller to the rear receptacle socket on the truck should have 0 volts at it when brakes or lever is not applied. Depending on the set up of your trucks electrical system the 12volt power lead at this same receptacle could have either battery voltage or chargine system voltage depending on if the truck is running or not. It may have a way via relay to shut off the voltage when the truck is shut off. dont know. But i do know you shouldnt have 3.9 volts at the charge wire.. thats beginning to sound more like the brake controller when activated slightly.

Vinnie
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Old 01-26-2009, 12:49 PM   #3
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Thanks Vinnie
I am going to disconnect my brake controller and recheck. Just to make sure it isn't that.
Does anybody know of a hidden fuse or a relay in the 12 volt lead? because if it is my brake contorller going bad, then I still don't have 12 volts to the trailer.
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