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#1, if you plugged in without the EMS & things were different, it was the EMS that was kicking in & out because of a defect in the incoming power. #2, all 50 amp RV connections have the potential for 240v, but nothing in your trailer uses 240v.#3, The grouchy maintenance guy has no clue what he is talking about. #4, Get a multimeter & check back.
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