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Open Roads Forum  >  Tech Issues

 > Onan 3.6 won't crank

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guy48065

SE Michigan

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Posted: 09/04/22 03:53pm Link  |  Quote  |  Print  |  Notify Moderator

A friend asked me to help troubleshoot his RV generator.
It will not crank using the onboard start switch or the remote on the switch panel.
Using a meter I verified there is solid battery voltage at the starter solenoid. There is one small white wire on that lug that I assume powers the control & start circuits.
Using a meter I determined which terminal on the solenoid needs switched 12v and I jumped it and the genny cranked.

Anyone have a wiring diagram of the control circuit?
I'm hoping there's a fuse or an interlock somewhere I haven't discovered.


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Gary45

Oshawa, Ontario, Canada

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Posted: 09/05/22 10:37am Link  |  Quote  |  Print  |  Notify Moderator

There should be a 12 volt fuse near the control panel on the generator. If bad will not crank.

guy48065

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Posted: 09/10/22 02:55pm Link  |  Quote  |  Print  |  Notify Moderator

I assumed there would be but I can't find one.

Gary45

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Posted: 09/11/22 07:05am Link  |  Quote  |  Print  |  Notify Moderator

Assuming the info I found on the internet for Onan 3.6 is the model your friend has shows in a pic location of fuse, sort of on the right bottom corner side. My 4000 has it on the front of the control panel.

guy48065

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Posted: 09/11/22 08:57am Link  |  Quote  |  Print  |  Notify Moderator

A link or something would be great.

I took apart the panel but there's no fuse on or in it.
Could it be some rinky-dink inline fuse tucked out of sight?

Gary45

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Posted: 09/11/22 10:42am Link  |  Quote  |  Print  |  Notify Moderator

On the the Onan there should be a small plate with the model number and serial number that's the info you need to search the internet accurately, the manuals are online. The 3.6 should flash out an error code on the stop start switch led

guy48065

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Posted: 09/12/22 03:02pm Link  |  Quote  |  Print  |  Notify Moderator

You need power to flash an error code.

I guess there's nobody else active here with an Onan 3.6 that chime in about where the fuse is hidden.

bounder39zman

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Posted: 09/18/22 12:21pm Link  |  Quote  |  Print  |  Notify Moderator

bear in mind that Onan start/stop control switches are switching grounds, not batt voltage. Sounds like your start solenoid and starter are ok since it cranks when you jump 12v to solenoid start solenoid. Since neither switch will activate starter, I would suspect bad control board or ground circuit to control board. Also, disconnect remote panel wire harness, and try it at generator control. If it cranks now, you have a shorted harness on stop circuit, as the stop circuit overrides start circuit.

guy48065

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Posted: 09/18/22 02:58pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the suggestions.
I still want to check the simplest things first. The fuse that's shown on the wiring diagram. That I can't find on the unit.

guy48065

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Posted: 09/18/22 03:02pm Link  |  Quote  |  Print  |  Notify Moderator

This is probably a stretch but the last thing my friend did before having this problem was change the oil. There are YouTubes that claim filling the oil up to the 'FULL' mark on the stick can cause the genny to mysteriously shut off after a few minutes. I'm wondering if 'too full' could also prevent cranking?
I'm doubting this is my problem since the start switch has no light at all & I assume an oil level interlock would let the switch light up & allow cranking.

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