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Open Roads Forum  >  Tech Issues

 > Onan 3.6 won't crank

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bounder39zman

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Posted: 09/18/22 06:41pm Link  |  Quote  |  Print  |  Notify Moderator

need to know "spec" letter, and serial no. of gen to know which control system you have. In any case, oil level has NO EFFECT on starter and cranking operation. Older spec units did have low oil level cut out switch, but did not prevent starter operation. And...these units dont hold much oil (imho) and should be run at full crankcase level for maximum engine protection. Lots of useful info on internet,,,lots of B.S. too

guy48065

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Posted: 09/19/22 05:36am Link  |  Quote  |  Print  |  Notify Moderator

Spec: R
SN: B170148513


05 Durango Hemi
2010 Neo all-aluminum 7x20 CH

Gary45

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Posted: 09/20/22 10:10am Link  |  Quote  |  Print  |  Notify Moderator

There is more than one type 3.6, the full model number would help.

guy48065

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Posted: 09/20/22 11:26am Link  |  Quote  |  Print  |  Notify Moderator

Ok here's the label:

[image]

Gary45

Oshawa, Ontario, Canada

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Posted: 09/20/22 03:17pm Link  |  Quote  |  Print  |  Notify Moderator

This url will take you to a page for your unit, there is a download section where manuals are, in the operator manual section 4 page 21 there appears to only be an AC breaker. This manual does not have a wiring diagram unfortunately. I did find another manual with a wiring diagram, it showed 12 volts going directly to control board, I'll find it again and post link however while it's for a 3.6 not exactly the same model.


https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwi4x9r9oKT6AhVIhIkEHY01CR8QFnoECBAQAQ&url=https%3A%2F%2Fwww.coloradostandby.com%2Fcummins-onan-3-6-ky-fa-26120-rv-or-commercial-generator-set-rv-qg-3600-lp&usg=AOvVaw2EMtr_TesUTaxXFTnvSi-u

guy48065

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Posted: 09/20/22 03:48pm Link  |  Quote  |  Print  |  Notify Moderator

The Install Manual there for Spec "R" does include a wiring diagram and it does have one difference compared to all the other earlier-Spec manuals I've downloaded: IT DOESN'T SHOW ANY FUSES.

Really I can't recall the last time I saw a product that connects DIRECTLY to a vehicle battery that didn't have a fuse internal or in-line for component and fire protection.
Very strange. Very stupid, IMO.

Gary45

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Posted: 09/20/22 04:20pm Link  |  Quote  |  Print  |  Notify Moderator

On the wiring diagram it has the jack pin out where you could see if you have 12 volts at the control board. It is kind of strange, no fuse, you might need the control board. If it was mine I'd be inclined when all figured out to add a fuse.

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