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Onan will not fire


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#1 Phluphy OFFLINE  

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Posted October 15, 2015 - 10:24 AM

20 hp Onan on Craftsman Indy500 ran perfectly until it was turned off.  Went to restart...nothing. Light on panel came on a few times. Will crank only by jumping across terminals on solenoid and crank without hesitation. Apparently there is no fire and as such thinking it's an ignition oriented safety switch.

I'm thinking one of the safety switches is acting up.

One under seat seems to be working.

Anyone know where switches are located in the firing circuit?

The deck PTO is disengaged.

30 amp fuse is good.

This is the one used as my avatar.

 



#2 larrybl OFFLINE  

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Posted October 15, 2015 - 10:41 AM

Do you have the model number handy? I could look at the diagram for you.


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#3 Phluphy OFFLINE  

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Posted October 15, 2015 - 10:56 AM

Thanks.   917.254422

Do you have the model number handy? I could look at the diagram for you.



#4 MH81 ONLINE  

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Posted October 15, 2015 - 11:33 AM

Key switches can cause this too.
Do you have a spark checker?
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#5 Phluphy OFFLINE  

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Posted October 15, 2015 - 11:50 AM

Key switches can cause this too.
Do you have a spark checker?

No, I have never heard of such a tool.  Hoping it's not the switch.  Have replaced it 2 times in past year.



#6 larrybl OFFLINE  

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Posted October 15, 2015 - 12:23 PM

I'll post the info once I get home this evening, if someone else dosn't beat me to it.


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#7 Bolens 1000 OFFLINE  

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Posted October 15, 2015 - 12:32 PM

No, I have never heard of such a tool.  Hoping it's not the switch.  Have replaced it 2 times in past year.

 

Spark testers come in a  few different forms, the one I stock is this one below,

https://bolenspartsa...nition-systems/

 

Basically its a way of checking for loss of spark while running or weak spark, sometimes eventhougn you'll get spark by checking with the plug out it may not be strong enough to fire while under compression

 

I am not familiar with your model but it sounds like a possible key switch/ fuse issue???


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#8 tiretrx OFFLINE  

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Posted October 15, 2015 - 01:08 PM

No, I have never heard of such a tool.  Hoping it's not the switch.  Have replaced it 2 times in past year.

 

If you've had to replace the switch twice in the last year, perhaps you have a short/ground issue. I would check all connections for integrity in either case.

 

Good luck, keep us posted :thumbs:


Edited by tiretrx, October 15, 2015 - 01:08 PM.

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#9 larrybl OFFLINE  

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Posted October 15, 2015 - 01:36 PM

This should be close. Looks like mine, the PTO Switch, and Clutch/Brake Switch will prevent the engine from cranking.

 

The PTO Switch, and Operator Presence Relay will stop the PTO if you get off the seat.

 

I have had trouble with the PTO switches on both of mine in the past.

Attached Thumbnails

  • 917.254450.jpg

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#10 Phluphy OFFLINE  

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Posted October 15, 2015 - 03:57 PM

Spark testers come in a  few different forms, the one I stock is this one below,

https://bolenspartsa...nition-systems/

 

Basically its a way of checking for loss of spark while running or weak spark, sometimes eventhougn you'll get spark by checking with the plug out it may not be strong enough to fire while under compression

 

I am not familiar with your model but it sounds like a possible key switch/ fuse issue???

I have been contemplating the fuse as the receptacle appears to be in fairly bad shape and one of the fuse prongs has been arced considerable.

Yet another part to locate.  Hoping there is nothing special about a aftermarket fuse holder.

Thanks for your response.



#11 Phluphy OFFLINE  

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Posted October 15, 2015 - 03:59 PM

If you've had to replace the switch twice in the last year, perhaps you have a short/ground issue. I would check all connections for integrity in either case.

 

Good luck, keep us posted :thumbs:

Been kicking around a possible ground issue.  Will go over every wire, from point to point.  As stated it ran great, until I turned it off.

Thanks for your response.


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#12 tiretrx OFFLINE  

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Posted October 15, 2015 - 11:37 PM

Been kicking around a possible ground issue.  Will go over every wire, from point to point.  As stated it ran great, until I turned it off.

Thanks for your response.

 

No problem, sometimes you get lucky and it's something that doesn't hurt the wallet. Never hurts to check.

 

Keep us posted  :thumbs:


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#13 Phluphy OFFLINE  

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Posted October 16, 2015 - 04:16 PM

Tracked it down to the cluster of wires at the solenoid, one of which, a white one, is spliced with a butt connector.  Others appear solid and undamaged. Jiggling the mass, with key on, caused the monitor light to blink a bit and it did turn over/start for a short while before cutting out when the light went out. Will get into it tomorrow.

Feel a bit of progress was accomplished.


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#14 tiretrx OFFLINE  

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Posted October 17, 2015 - 09:59 AM

Cool beans  :thumbs:



#15 Phluphy OFFLINE  

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Posted October 18, 2015 - 03:51 PM

Problem solved, runs better than it did since purchased.

Loose OEM connector on base of solenoid.

It actually purrs now, as an Onan should when idling.

Now to locate a new pump for B&S model and all will be back to working...fingers crossed.


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