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Old 06-24-2021, 09:47 AM   #1
Join Date: Apr 2015
Posts: 42
Onan 12.5K low voltage

I have an Onan 12.5k from 2001 that only puts out 117V with no load. When 1 AC is on each side(~12A on both sides), the voltage stays at 117V, but 2 AC's on one side (12A on one side and ~24A on the other side) drops the voltage to 113.5V on the side with 24A. The voltage on the 12A side remains at 117V.

I have looked for an adjustment, or other similar issues, but have not found anything.
The generator starts and runs great, I changed the belt, fuel and air filters, and oil and coolant within the last year and cleaned the soot port. It is the single belt model Onan or was converted to single belt by PO. We do not use it much, it has 450 hours total on it.
Steve & Shellie
'01 Country Coach Affinity 42 #6012 Cat C12
16 Wrangler
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Old 06-24-2021, 01:35 PM   #2
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I think you are ok. Are both ACs running good?
2001 Itasca Suncruiser 32V F53
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Old 06-24-2021, 01:39 PM   #3
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The 'rule' I've seen is 120 volts +/- 10 percent. So anywhere above 108 volts you should be fine.
2013 Winnebago Sightseer 36V
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Old 06-25-2021, 10:40 AM   #4
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Don't think there is an adjustment.

The higher the load, the controller adds fuel to keep the rpm's at 1800.
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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Old 06-25-2021, 11:54 AM   #5
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The AC units seem to run fine. I always thought the rule was 5 percent so I tend to reduce the load at about 114 volts or lower. I monitor the coach voltage all the time.

Is it possible my governor is off a bit? Is 117V with no load expected? I would like to see 120V or even a couple more with no load applied.
Steve & Shellie
'01 Country Coach Affinity 42 #6012 Cat C12
16 Wrangler
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low voltage, onan

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