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There is no inverter on this set............are you trying to determine if it is putting out 120 VAC or do you have a charging problem on the 12 VDC side? Please explain the issue.
O.K.............most of the "inverter" questions we get are concerning the inverter/charger for the system. I don't have a manual for that set and I will opt out and let our Onan tech offer something. He stays really busy, so I don't know when he may be available to answer your question.
There is no test for the inverter.
If the alternator is putting power into the inverter, but you have nothing coming out, the inverter is bad.
The inverter is not repairable.
Sometimes Onan has a factory refurbished inverter available, but not very often.
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