I suspect as H=John has said, the grounds are suspect. Winnebago does not use 12v ground bars, and then one large wire to the ground, but many times takes bundles of the yellow wires that are grounds, to the chassis to ground them. They may do this in more than one place.
On my View, on the Mercedes/Dodge chassis, they did this in two places, one up near the steps and one back near the generator, and did what Mercedes does not allow, and that is to punch a hole in the chassis Possibly using an air hammer and tapered punch, Mine did not look like they were drilled but they could have been. and then used a very fine machine thread screw that cuts its own threads, and used it to secure all of these individual ground wires. Since Benz does a good job of painting the chassis they took a sanding disk to make a bare spot for a good connection, but failed to treat or protect it in any way.
You can only see two smaller grounds, but there are several behind that out of view. Note the rust around the ground where they sanded the paint off. I had to sand it clean and mask a dime sized area and prime and paint the remainder. Then I coated the area in Amsoil Metal Protectant and all of the terminals and the bolt and tightened it. After I was done, I sprayed the entire area with the metal protectant.
I'm showing this to emphasize that even Winnebago screws up and this is a good example. If yours is done similar, the grounds may be rusted and corroded and in need of cleaning and treating to prevent further rust or corrosion.
Charles
