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Old 06-07-2020, 08:34 AM   #1
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Generac Q55g popping 20A breaker

New to me coach, a 2000 National SeaSreeze 35ft with two roof AC units. I've been having issues with the Generac popping the 20A breaker on the generator.
I found a thread here from ten years ago that mentioned that sometimes the 20 and 30 amp circuits get swapped if the person servicing the generator was sloppy.

So after a little research, I found that flipping off the 30A breaker does not switch off the microwave meaning that both the MW and front A/C are on that 20A breaker.

It would make sense that the 30A breaker should run the kitchen and front A/C and the 20A should run the rear A/C as well as some subset of non-kitchen load, but I don't have a wiring diagram for the coach.

I can't switch off the 20 amp breaker manually as it was changed out at some point with a push button style.

The issue I have is sometimes when running the front roof air, the 20A breaker pops after 10 min or so. Yesterday I reset it after it popped and it ran the front A/C the rest of the afternoon.

Any ideas?
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Old 06-07-2020, 01:59 PM   #2
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Turn OFF MAIN AC Panel breakers
Turn off GEN and trip the breakers
Remove cover on Gen breakers swap the load wires 30A to 20A and 20A to 30A

Replace cover...close the breakers......close Main RV Breakers
Start gen and test if front A/C and Microwave are now n 30a and rear A/C on 20A
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Old 06-07-2020, 04:05 PM   #3
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Second option, find junction box between generator and RV wiring, back near generator.

Open that and swap red and black.
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Old 06-07-2020, 08:38 PM   #4
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Yay. All fixed. Thanks everyone. Swapped red/black.
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breaker, generac

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