Wow sounds like a ROTTING kind of Situation a little like the rest of the Country
If you know how to wire up a 5 wire relay you should be able to use the jake on/off switch wires to do anything you want
I had one do this last week with 10,000 some engine hrs, I open the relay box door found the inside VERY wet because the black Capplug had fallen...
Like the guy's stated above You have a Short between the Right turn or Green wire and the Brown wire if wired correctly, It could also be shorted...