I found a disconnected wire plug under my dash on the far left hand side. It is part of a harness that goes to the light switch, It is a blue plug with 5 wires. Black, Red. Grey. Green/Blue, Green/red. I cant find where it would plug in. Not sure if it was unplugged before muy pother problems but I think it should have a mate some where. Thanks again

 

That blue plug is for a brake controller for connecting to trailers with electric brakes.

 

The blue plug is part of the factory trailer towing harness.

See Here Scroll down to the Dodge info.

 

I should have mentioned this in original post. I have an elctric brake unit installed. And yes it does plug into a blue plug that comes out nearthe fire wall. This plug comes from the same pigtail that feeds the light switch. I thought it was for the brakes also but that plug is already being used by the btaking unit. .