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Mark, I thought about the heat issue last night and I cannot explain why the isolator would get hot.
I don’t know your coach so I can only relate to mine. My isolator is nothing more than a one way valve. It lets electric flow only in one direction. Very little current flow should occur if the batteries are charged. If they are deeply discharged then the current flow amps up a lot so that would create heat.
You might want to not only measure temps, but use an ohm meter and verify current flow only in one direction. Other than that I got nothing, the story of my life.