O.K. My trailer is in for the A/C, so I did mention this to the dealer, dealer knows about this problem, seems to be common on the rigs with built in generators. The dealer told me it is the switch on the inverter that goes back and forth from plug in or generator use. It seems to get stuck half way and causes the humming. I will let you know how this turns out.
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2010 Fleetwood Discovery 40X
2009 Hummer H3
2011 English Bulldog (Tilly)
2009 Club Car Golf Cart
2020 Ram 3500 Dually
(Reserved for new trailer)
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