There seems to be a lot of conflicting issues with your coach. Did you buy it new?
The reason I ask is to know if anyone has inspected it to see if there was possibly some exposure to high water. Not necessarily a total flood but high enough to get in to the basement compartments and some of the engine electrical connections that seem to be failing on an unpredictable basis. From having experience with vehicles that have been in deep water, they can look good but the electrical connections will continue to corrode and cause future problems.
