Currently boondocking in our 2002 McKenzie Rogue Class C at state fair - generator (Onan 4000) running great for about 5 hours - then power went off. Generator still runs great, but no AC, no power to outlets, etc. We pressed the reset, checked wizard, checked GFCIs, flipped breakers, and replaced the breaker switch on generator - still no power - We got it to click on- lasted about 3 seconds. Went thru all steps again - did the same thing. Someone mentioned "transfer relay"... If that might be the problem, where on earth is it? We have looked everywhere we can thinking of without opening walls.....