Microwave Issue

If everything works fine in the driveway, sounds like the campground has power problems. As posted above, get a meter and CAREFULLY check the incoming voltage. It should be somewhere between 110 and 125. Also check the items listed about but with it working the driveway, I would highly suspect the campground has problems. Especially during high use times.

Be careful when playing with 110 VAC ciricuits unless you are qualified. That said I just had to repair my microwave and discovered that the cheap RV dedicated outlet above the microwave had very badly burnt and corroded internal knife-blade terminal that were obviously heating up and creating circuit resistance which would drop the voltage being recvied by the microwave.
I would have someon checkout your micorwave outlet and make sure it's not heating up and failing internally.
A telltale sign of this happening would be discolouration and pitting on the microwave power cord plug spades. Have a quick look att hem for discolouration and pitting.
Secondly your circuit breaker could be heating up and drawing down the voltage arriving at the microwave as well.
In your driveway your supplied AC power could be marginally higher than at campgrounds and that's why you are seeing it happen.
try plugging the microwave in a different outlet of the trailer while at a campground or plug the microwave directly into a 15amp outlet on a campground power pedestal and see what happens. This would rule in or out your trailer as a contributing factor.

Thanks for the replies. I didn't realize there might be a voltage drop that could be causing the problem. I'm not an electrician, but I should be able to check the voltage at the hookup box. We'll be back at the same campground in a couple weeks and I'll check.
If that's the case, I guess I'll need to put an autoformer on my Christmas list.

What is the voltage???? like pianotuna asked.My Dad always said " you can't tell how deep the well is by looking at the pump handle". Buy and learn how to use a VOM = Volt Ohm meter

Hi Kris,

What is the voltage in the campground? If it is low, you may need to add an autoformer to your camping gear.

kill-a-watt

watt meter