If you look under the hood on the driver side ( on the right is you look in ) there is a wire harness marked for the different lights and a wire attached to vertical frame member. It seems to me that is where we need to start. When it comes to things like this I only enough to be dangerous. I'm going to take it to mechanic that I trust to check it out for me.
2012 Georgetown 378TS Fire Mist
2008 Honda Fit
ReadyBrake™ Surge Brake System integrated with ReadyBrute™ Elite RV Tow Bar