smkettner wrote:
Still, get the outlet tester. Still could be reverse polarity as there is no neutral ground bond in the RV.
If there is no neutral/ground bond in the RV, then GFI's wouldn't work. I think neutral in the camper should be connected at the power center to the incoming ground (not earth, the green ground wire on the 30 amp cord). A problem with this conductor going into your camper will let all AC "float", which can be hazardous if some stuff in the camper is not using polarized plugs. A quick way to test this is to look for voltage between neutral (white) and ground (green) at various points in your power chain.
This issue is one reason why it is important to check shore AC before plugging in.