That's very strange, the microwave is 120 volts, and the fan and light is on a 12 volt circuit. The two aren't connected, at least on our TT.
Every day's a learning experience, though sometimes not what we expected.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley