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What make and model coach or trailer are we talking about here? Hooked up to shore power or on genset power? What, if anything, have you tried? Please get back to me with this info and I can assist you further.
Are you sure that the polarity from the house outlet is correct? And what is the "I grabbed handle and felt a surge" here? Did you get a shock from something? IF SO, that can be dangerous! Would a phone call chat be more helpful?