To rule out problems with the trailer wiring, unplug the microwave and use an extention cord to a known good outlet. If it works, it's the trailer wiring, if it doesn't work, it's the microwave. It seems like these days, small appliances are more "disposable" rather than repairable, but if you take the top cover off, you'll probably find a couple of glass fuses on the circuit board. One of them may be blown. I'd check by using an extension cord to speed up your troubleshooting process.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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