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Old 07-28-2014, 08:36 PM   #1
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Dumbo generator question

I know the house batteries have to be good to crank generator but do they have to be good for it to remain running?
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Old 07-28-2014, 08:41 PM   #2
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yes almost all engines require voltage for their control systems
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Old 07-28-2014, 08:56 PM   #3
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What mine was doing (before I replaced a bad converter) was it would run about 15 to 20 minutes with air conditioners running and then the gen would stop running and of course the air shut down also.
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Old 07-28-2014, 08:57 PM   #4
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the gen also sounds like it is running too fast.
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Old 07-28-2014, 09:41 PM   #5
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Does your generator sound like it's running fast both under load and without load? Your genny will speed up as you increase the load on it.
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Old 07-28-2014, 10:20 PM   #6
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Quote:
Originally Posted by TonyDi View Post
Does your generator sound like it's running fast both under load and without load? Your genny will speed up as you increase the load on it.
RPM really doesn't change (when it's working properly) the sound changes because the engine is working harder. If the engine speeds up, you won't have the 120 v 60 Hz it's supposed to generate. Newer generators, called inverter generators, do vary speed by load, but unless upgraded, I doubt the original 1998 generator would be of that type. If your generator is capable of signaling error codes, you might see why it's shutting down. (Check manual for instructions on codes and what they stand for)

Common issues are overheating or low oil pressure. A lack of 12 v to the control board could also trigger a shut down.
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Old 07-29-2014, 06:01 AM   #7
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Quote:
Originally Posted by Bama Fan View Post
I know the house batteries have to be good to crank generator but do they have to be good for it to remain running?
Depending upon the model number, your unit may or may not require a seperate 12v source once it's running on it's own. Definitive answer depends upon your model, please post it :-)

Quote:
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the gen also sounds like it is running too fast
Again, this depends upon the model number. Your signature says you have a 98 gas coach, if you're referring to your generator then no, yours will not vary RPM based upon load/demand. If you are hearing serious fluctuations in rpm there could be issues with the governor controller. The only way to troubleshoot and/or determine the proper RPM is by using a volt/ohm meter that will display Hertz/Cycles or Frequency.

Quote:
Originally Posted by Bama Fan
What mine was doing (before I replaced a bad converter) was it would run about 15 to 20 minutes with air conditioners running and then the gen would stop running and of course the air shut down also
As Bflinn mentions in his response, it could have been the lack of 12v due to the failed AC-DC converter. If your batteries were in poor condition and the coach was basically running only from your converter, then a failing converter could certainly cause your genset to shut down due to low or lack of 12v power IF your genset model is one that requires a seperate 12v source. (We don't know your model #). Being an air-cooled unit (again, no model #) there would be no overtemp sensors, and again, depending upon model number, there may or may not be either low oil level or oil pressure sensors.
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Old 07-29-2014, 06:25 AM   #8
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My friend had the same problem, the generator would run for about 15 t0 20 minutes under load and then it would just stop. found out he had a bad circuit board.
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