It could be the campground. We, personally, have had electrical problems at two campgrounds. One at Chester Frost in Hixson/Chattanooga, TN where a camper "fixed" the power at their campsite so they could have electric (and shut down half of Dallas Island) that is also the same place where the folks across from us in a site would get a tingle from their camper when it rained (I reported to park rangers and they got the park's electrican out there to fix it). Years later in Georgia Veterans SP in Cordele, GA one of the sites we pulled into would not run the Class C. We changed sites and reported to the park rangers that we had moved and why. Electrican told us someone had rewired the power pole.From what the rangers and electricans have told me, idiots rewiring the power poles is a very common thing in public campgrounds. Not so much in private ones, although both our current park here in Roswell (no adapters allowed) and Socorro have both had electricans fixing the power poles several times per year while we have stayed there. The Socorro park had one RVer blow the whole system. He was pissed. Seems it was the park's fault as his coach worked just fine at his house.
I used to have the little yellow plug in tester on an adapter (see 30 amp plug tester) but lost the thing (I think I left it in the Class C with Das Mel who needs one anyway, or it's just gone). I need to get another one. I keep forgetting to pick one up from work. David says that once we get our homebase he will switch our panel box over to 50 amp.
On the lefthand side of the page, read "30 amp Service", "Outlet Testing" and "Campground Service". Please do not rewire the park's power pole. You would be amazed how often that happens, especially in public campgrounds.
Build yourself one of these after you fix your electric.30 amp tester
or 50 amp tester
You plug this into the campground power supply.
Anyone who is plugging in an RV plug at home should be plugging into an RV receptacle. You can easily buy them at Home Depot or Lowes. If you are running an RV-30 amp plug then you need to be plugging into an RV-30 or TT-30 (same thing) recepticle that is wire properly.
If you are running a 50 amp bus, then you need to be plugged into a 14-50R receptacle that is wired correctly. Here is how you wire it correctly
(warning! direct link to a PDF download). Do not trust your electrican to do it properly, print out and hand it to him, then make sure he does it as shown on the paper before you plug your bus into it. Mobile/RV 50 amp is a different animal than residential 50 amp. We have had to print this page off when we were food vending at events for electricans as few were familar with mobile 50 amp.