Hi Gary,
We had a similar issue with our 2014 Southwind, stopped into an RV Superstore in Florida, and after 5 hours they could not trace the problem!
I was able to convince them that I was not paying for their lack of service.
The next day I contacted a mobile RV repairman, and within 45 minutes he traced the problem to a blown 25 amp "in-line" fuse located high up in the dash behind the speedometer!
The fuse was not identified anywhere and really did not make sense as to why it was located where it was. The same fuse controlled the levellers and chassis fan blower for the dash heater.
Good luck with your search for the cause of your problem.