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paulz
Member
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# Posted: 25 Oct 2025 08:38am
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Yesterday my Onan quit putting out AC, had to switch generators to finish my work. Checked the usual things, GFI sockets, Onan circuit breakers, nothing. It has two lines and breakers, both out. Digging deeper, I pulled a breaker and jumpered around it, no help. Then pulled the brushes, look fine. Only other thing besides the alternator coils is the voltage regulator. Have to have that professionally checked apparently. Anyone been here?
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gcrank1
Member
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# Posted: 25 Oct 2025 07:42pm
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Other than the obvious things you have checked there has to be an output spec from the unit before it goes into the regulating unit. Check output there 1st.
I suspect the unit is an alternator that feeds a voltage regulator and some rectified into dc? If those dont get fed base power they wont work.
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Brettny
Member
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# Posted: 26 Oct 2025 08:29am
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Did you ohm out each coil?
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paulz
Member
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# Posted: 26 Oct 2025 12:26pm
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It has two slip rings with brushes. Im getting 22.7 ohms measured between the two.
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Brettny
Member
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# Posted: 27 Oct 2025 07:05am
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No shorts to ground? If not I would suspect the voltage regulator.
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paulz
Member
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# Posted: 27 Oct 2025 07:34am
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Yeah thats my thought. But a new regulator is 500 clams. Model is Marquis 7000. It did run out of fuel (lp) shortly before AC went away. Sputtered and could have pulled a wire loose but it restarted and i split wood for another 10 minutes before AC went away.
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