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Old 05-04-2012, 01:00 AM   #1
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Onan 4000 will not turn over

I have a 4000 watt onan generator in a class A motorhome. Yesterday I ran it for about 1 hour, (turned over and started fine), and shut it off. Later that day I tried to start it and only the solenoid clicked. I started the MH, checked voltage on the lead to the starter and got 14.2 volts. Tried to start again, solenoid clicked and did not turn over. Then jumpered the solenoid direct to the starter, no go. Pulled spark plug to check it didn't hydralic lock, all good. I'm thinking it's the starter for sure, anything I can try before removing???? One other thing, when I attempt to start, it dims the lights in the motorhome, so there is a good current draw happening.
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Old 05-04-2012, 03:26 AM   #2
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Be certain that you have a good ground from the battery to frame and from the frame to generator ground lug. Good luck and keep us posted.
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Old 05-04-2012, 07:31 AM   #3
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What is the Serial/Model number is it? I may have some info.
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Old 05-04-2012, 07:34 AM   #4
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Quote:
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Be certain that you have a good ground from the battery to frame and from the frame to generator ground lug. Good luck and keep us posted.
A great place to start, very often connections and battery condition are the source of the issue.
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Old 05-04-2012, 08:35 PM   #5
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I'll have a chance to look at it tomorrow and report back Sunday or Monday. Thx.
One question,
I was wondering if it could be a ground when it appears there is a high current flow through the system when I try and start it. Would a poor ground not do just the opposite???
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Old 05-05-2012, 02:27 AM   #6
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It is dimming the lights due to voltage drop. It could be a battery issue and generator is trying to turn over form the converter output. This will drop the voltage dramatically and you see this in your lights getting dimmer.
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Old 05-26-2012, 02:19 PM   #7
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Finally had a chance to work on this issue. Turns out the starter drive for some reason was engaged (jammed) in the starter ring gear. Gave a tug on the flywheel it freed itself and then it turned over and started fine. Not sure why this occurred, perhaps there is a flat spot in the starter. Started and stopped it a half of dozen times and works flawlessly. thx.
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Old 05-27-2012, 03:43 AM   #8
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Glad to hear you are up and running.
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