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I have a Progressive Industries 50 amp surge protector hard wired in and with out a ground the relay won’t pull in then after that the transfer switch needs a ground also. The other day I had gen running plugged it in to bus with a 50 to 30 to 15 amp adapters and with my volt meter the 15amp plug had 125v between the 2 prongs hot and neutral but no power between round plug (ground) and hot,I plugged it in to bus and no go. Your Country Coach I’m surprised it would work.