Another possibility is somewhere in the coach a single incoming line was connected to both legs going to the coach AC panel. Because of the amp readings it would have been done prior to the surge guard.
Another question for oldbird, are the surge guard and autoformer permanently installed or portable units? Were either of these removed and reused from your previous coaches?
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2007 MS 36 TK3, Demco Glide Ride
2012 GMC 3500HD D/A CC, AirSafe Hitch
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