Microwave and converter fried at campground

[Mike_Schriber]

Just got set up at a campground in Colorado Springs and I have a big problem. Everything seemed to be working correctly electrically initially but when we came back to camp I found the front air conditioner breaker blown, the microwave off and the battery not charging. I reset the AC breaker and the unit seems fine.
I then checked the outlets for the microwave and converter (each on a separate breaker) and they had power. The converter smells fried and is not putting out any power and the microwave appears to be history.

Doing more testing, I used a circuit checker to test the other outlets. One circuit showed that the hot and ground were reversed (the laptop plugged into that circuit also stopped charging). I switched from the 50 amp plug to the 30 amp and the circuit showed good. I'm now figuring that one leg is wired wrong at the pedestal on the 50 amp outlet. However, I switched back to the 50 amp circuit to double check and now the circuit shows normal.

I'm really stumped. I know it's not anything on the motorhome side but I can't explain the shifting readings. I plan to have some words with the campground management in the morning and I'd love to have some idea what's going on with their power before I do.

Any thoughts?

Thanks!

[Mike_Schriber]

I'm not sure what might have happened voltage wise. The circuit tested indicated that hot and ground was reversed but I haven't been able to repeat that reading. It did seem to be normal at first and that changed during multiple plugging and unplugging as I switched from the 50 amp and 30 amp outlets.

I'm having trouble seeing how such a reversal can be intermittent.

[MEXICOWANDERER]

It takes well in excess of 200 volts RMS to damage an OEM laptop brick (despite what its label may say).

You need "proof" an that proof can be best created by use of a multimeter and cellphone camera. Have a 2nd help with the images.

Meter probes stuck into campground receptacles. Image shows probes, receptacle and meter reading. Same with block type plug-type connection verifier. With meter get L1 to L2 voltage. L1 to LO and L2 to LO. L1 and L2 to socket earth ground ground. Socket earth ground to actual ground around your feet.

I would not give advance warning. Turn images into glossy photographs. Then present management with a stack of photographs at your first announcement. They'll hate that for good reason. Attorneys despise documentation for a reason.

Good luck.