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Old 09-08-2012, 02:34 PM   #1
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ONAN 7.5 GENERATOR won't keep running

Genset in my '98 Winnie Chieftain. It will start, then immediately shut down. I'm told it's probably a stuck or faulty low oil
Pressure cutoff switch. WHERE IS THIS SWITCH LOCATED? Sure hope someone out there knows. Any help very much appreciated. Thanks..
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Old 09-08-2012, 04:03 PM   #2
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Should be by the oil filter behind the cover I know you looked but is the oil to the line while checking on level ground
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Old 09-08-2012, 06:24 PM   #3
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Hopefully that's all it is. I had to take mine in the shop for the same thing and found it to be a faulty computer module to the tune of $3500. If you press the bottom of the start button on the unit you will get a code flash in green. Just count the number of flashes and you can call Onan direct to assess it.
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Old 09-09-2012, 05:49 PM   #4
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Thank you my friends..If it turns out to the computer module, I may have a gen set less MH!! Thanks again.
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Old 09-13-2012, 12:02 PM   #5
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Quote:
Originally Posted by Chaplain Bob
Thank you my friends..If it turns out to the computer module, I may have a gen set less MH!! Thanks again.
Well...does anyone know where the main circuit board is on this unit?
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Old 09-13-2012, 01:33 PM   #6
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I'm having a similar issue with my '02 5500 generator. It's a carb-equipped model, so I don't think computers were that involved in running it.

The symptoms are that it lights off and starts to run, but as soon as the regulator starts to move the throttle, it dies. I think I'll be taking the carb off at the end of the season for a good clean-out. We don't use the genny much and I don't think the original owner of our MH did either. After 10 years, it only shows 48 hours on the Hobbs!

I had cardiac surgery in December last year and didn't get to my every 6 weeks generator run schedule until mid-April, by which time it was too late.
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