Sounds like transfer switch - or you have two problems (1. is buzzing transfer, 2. no power to 1/2 rig).
Does the generator have built-in circuit breakers? Mine has two mounted on it. You might try resetting them both and see if that gives power back. I've read about many that lose 1/2 their power and go to their main circuit breaker box but neglect the breakers on the generator itself.
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2008 Phaeton 36QSH, Safe-t-Plus, Quadra Bigfoot
2017 Jeep Cherokee Trailhawk w/ flat tow wiring mod.
Blue ox, BrakeMaster + BrakeAway, diode lights and charge.
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