[DonandBonnie]

This is a new situation that we've never encountered before. After six days in a campground we lost shore power. Our surge protector gave a reverse polarity/faulty ground reading. That made no sense since we had good power for the several days prior. The campground checked everything from the pedestal to the main campground feed and found nothing wrong on their end. A motor home next to us was plugged into the same pedestal. The campground tech noted that the motor home's a/c was cycling on and off in short bursts. When the motor home power kicked off, our surge protector began the count as if it was starting. When the motor home kicked in, our protector popped.
To shorten up the story, the tech checked the motor home plug and found a little discoloration on the ground wire that was laying over the hot wire. There must have been a small arc between the two that was causing the problem. Once the wires were separated the problem ended. Moral of the story - Your shore power problem may be caused by your neighbor, not the campground. By the way, the tech was friends with the motor home owner, otherwise he would not have touched any part of his rig to work on it.