Thanks for your reply TurnerFam. I am just quoting what a Magnum tech told me on the phone. I had tried numerous new GFI's with the same results. As soon as I changed the GFI to a model the tech told me to, my problem was solved. I never check any other wiring. For me anyway the older non self testing GFI fixed the problem. Maybe your coach doesn't have a self testing GFI and that's why it works.
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