Reversed Polarity and Open Ground

HGL wrote:
Just got back from camping a week ago, with our trailer plugged into our surge protector after three days we got an error message of reversed polarity and an open ground. We have done some trouble shooting on that circuit and on other circuits. Only when the trailer is plugged into the surge protector do we get the error message. Does anyone have an idea of what could be causing this?

Your surge protector is looking for a bonded ground and because it's not getting that from the power source it's interpreting this as an error. This is common when running from a genset that's not bonded, usually isn't when running from a hard wired shore power source since that source normally does provide adequate bonding. My bet is if you bonded the source output by connecting the neutral to the ground your surge protector would suddenly be quite happy again.