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Old 06-22-2021, 12:43 AM   #1
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Brand: Thor Motor Coach
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Generator runs but no power

As the title reads the generator in my 25.2 Thor Axis runs but there is no power to the AC or microwave!
Both microwave and AC work perfectly on shore power but when I unplug and start the generator nothing works! Any ideas?
TIA

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Old 06-22-2021, 12:56 AM   #2
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Have you checked the breakers on the generator?

Try tripping and resetting them without a load switched on and then retry.
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Old 06-22-2021, 01:16 AM   #3
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Was going to suggest the same thing……check your breakers
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Old 06-22-2021, 01:40 AM   #4
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I checked the ones inside the MH and they weren’t tripped! Are there any others I need to check?
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Old 06-22-2021, 01:45 AM   #5
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Originally Posted by sforl View Post
I checked the ones inside the MH and they weren’t tripped! Are there any others I need to check?
There are no Generator breakers inside your MH. The Generator output breaker(s) are on the Generator itself.

You may also have an Automatic Transfer Switch problem.
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Old 06-22-2021, 02:36 AM   #6
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There are breakers on the generator itself. If it’s a 50 amp coach you will have two breakers. Remove the generator cover plate and you will see them.

Attached pic from the internet but it shows the position on most generators.

https://www.bing.com/images/search?v...aw&vt=4&sim=11
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Old 06-22-2021, 02:40 AM   #7
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But they are not obvious. You’ll need to look on the side for a small black switch. Check the Onan owner’s manual for the exact location
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Old 06-22-2021, 01:33 PM   #8
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Originally Posted by Trophy1200 View Post
There are breakers on the generator itself. If it’s a 50 amp coach you will have two breakers. Remove the generator cover plate and you will see them.

Attached pic from the internet but it shows the position on most generators.

https://www.bing.com/images/search?v...aw&vt=4&sim=11
My 50 amp coach on has one breaker on the generator so it depends on the generator.
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Old 06-22-2021, 01:41 PM   #9
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Originally Posted by EA37TS View Post
My 50 amp coach on has one breaker on the generator so it depends on the generator.
My 240v generators have had a single handle double pole breakers for the 240v output
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Old 06-22-2021, 07:26 PM   #10
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Just wanted to post an update! The problem was the generator circuit breaker! It had been tripped! After resetting the AC still didn’t work so I checked the breakers inside the MH and the breaker for the AC had tripped! I reset it and everything is working well!
I can’t tell you how thankful I am to have access to this forum and for all the helpful contributors who have come to my “rescue “ time and time again!
Thanks to all!
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Old 06-22-2021, 08:51 PM   #11
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Exclamation

Quote:
Originally Posted by lwmcguire View Post
My 240v generators have had a single handle double pole breakers for the 240v output

yes, most 50amp coaches with diesel generators only have a single 'BREAKER' that can be accessed/seen on the front of the generator, although there are actually TWO breakers - they are tripped together whenever one does, just like in the Main Panel of your RV. Resetting one also resets the other.
The reason there are two breakers on the generator for a 50amp coach is because the 'power' for each side is fed back to the RV's breaker panel, which, of course, has TWO Main Breakers.
For some diesel generators that put out 40-50amps, you might have a 30amp and a 20amp breaker on the generator, while other larger generators will have TWO 30amp breakers, and so forth.
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Old 06-22-2021, 09:40 PM   #12
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Quote:
Originally Posted by sforl View Post
Just wanted to post an update! The problem was the generator circuit breaker! It had been tripped! After resetting the AC still didn’t work so I checked the breakers inside the MH and the breaker for the AC had tripped! I reset it and everything is working well!
I can’t tell you how thankful I am to have access to this forum and for all the helpful contributors who have come to my “rescue “ time and time again!
Thanks to all!
Good to see your problems are solved, and best of all it was free
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Old 06-23-2021, 12:55 AM   #13
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���� Free is good!
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Old 06-23-2021, 01:08 AM   #14
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Congratulations on getting everything back up and running!
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Old 06-26-2021, 10:31 PM   #15
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Glad you got it going. Couple quick thoughts.
Before turning the generator off, remove loads from it.
That will provide a moment or two of cool down and what’s more important, it will avoid a brown out type condition in the back end. That can be hard on voltage regulators and windings.
Considering air conditioners, make sure to not short cycle the unit.
Doing so will cause the generator to try starting the air conditioner while the internal head pressure is still high.
Allowing several minutes at least before letting the air conditioner to start up again insures easiest start effort.
Hope this helps and was worth while
God bless
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Old 06-26-2021, 11:24 PM   #16
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Thanks! Good to know!
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