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06-25-2022, 09:36 AM
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#1
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Junior Member
Join Date: Aug 2019
Posts: 10
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Onan QD 10K Won't crank - Solved
Many thanks to Engine Generator Specialist in Madison, WI for solving our problem and getting us back on the road during a very hot summer. I highly suggest contacting them if you're in need and in the area.
Since I didn't find a recent post with the symptoms we saw, I wanted to put it in a post to document this if someone else hits this issue.
Halfway through a 3 week road trip our Onan QD 10K just suddenly doesn't crank. I can hear the tick-tick of the fuel pump primer, but no cranking and an error code 32 (slow cranking). Battery power to the unit is good. Seems like a solenoid problem.
It's hot as hell and our dash A/C is not cutting it, so I contacted Engine Gen Specialist and they got me in in two days. And better yet, they found that the problem was a $12 relay on the circuit board. This relay is used to fire the solenoid. According to Stewart (the tech) there are 3 of these identical relays used on the circuit board, each controlling several items like fuel pump, solenoid and I forgot what else. So I purchased a 2nd as a spare!
So a happy ending and a low cost fix -- woo hoo!
Hope this helps someone else.
Chuck
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06-25-2022, 09:43 AM
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#2
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Senior Member
Entegra Owners Club
Join Date: Dec 2015
Location: Venice FL
Posts: 795
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Best kind of post! You had a problem, identified the solution and got away relatively unscathed. Thanks for posting.
__________________
Tim F.
2022 Baystar 3014
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06-25-2022, 08:18 PM
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#3
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Senior Member
Join Date: Aug 2016
Location: Scottsdale, AZ
Posts: 3,122
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Quote:
Originally Posted by cokerstrom
It's hot as hell and our dash A/C is not cutting it, so I contacted Engine Gen Specialist and they got me in in two days. And better yet, they found that the problem was a $12 relay on the circuit board. This relay is used to fire the solenoid. According to Stewart (the tech) there are 3 of these identical relays used on the circuit board, each controlling several items like fuel pump, solenoid and I forgot what else. So I purchased a 2nd as a spare!
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On the Onan 10000 & 12500 generators, the circuit board (also known as the control board) is a sealed part - see attached photos. There are three relays located close by, but they're not part of the control board.
The good news is that, as you found, the relays are not expensive. The control board, well, that's a different story. 
__________________
Larry & Amy Beckner
Scottsdale, AZ
2022 Newmar Super Star 4061
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06-25-2022, 08:51 PM
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#4
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Senior Member
Join Date: Mar 2014
Location: Campbellsville Ky
Posts: 531
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Got a part # for the relay?
__________________
2008 American Tradition 42C 2018 JUL Jeep Wrangler
2004 Newmar Dutch Star 4010 Spartan (Sold)
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06-25-2022, 09:30 PM
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#5
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Senior Member
Join Date: Aug 2016
Location: Scottsdale, AZ
Posts: 3,122
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Quote:
Originally Posted by 426smartin
Got a part # for the relay?
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Might not be the same relays on all Onan diesel generators, but the attached page from an Onan parts manual shows the three relays and a part number for them - see yellow highlights on the page.
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Larry & Amy Beckner
Scottsdale, AZ
2022 Newmar Super Star 4061
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06-25-2022, 09:36 PM
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#6
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Senior Member
Join Date: Aug 2016
Location: Scottsdale, AZ
Posts: 3,122
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Below are a couple of photos showing what I’m reasonably sure are the relays Onan uses. Hopefully, Chuck (“cokerstrom”) will let us know if the spare relay he purchased looks similar if not identical to these photos.
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Larry & Amy Beckner
Scottsdale, AZ
2022 Newmar Super Star 4061
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06-26-2022, 04:05 AM
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#7
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Senior Member
Entegra Owners Club
Join Date: Apr 2013
Location: Las Colinas, Texas
Posts: 2,099
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Thanks for the post Chuck and the detail and parts Larry - going to get a few to have in the fuse and relay parts kit.
__________________
Mark & Debra Wood, Las Colinas, TX.
2013 Entegra Aspire 42RBQ
2023 Jeep Wrangler Sahara 4XE
2013 Thor Challenger 37DT - Sold
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06-26-2022, 07:12 PM
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#8
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Senior Member
Join Date: Mar 2014
Location: Campbellsville Ky
Posts: 531
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Thanks!! 
__________________
2008 American Tradition 42C 2018 JUL Jeep Wrangler
2004 Newmar Dutch Star 4010 Spartan (Sold)
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06-27-2022, 07:48 AM
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#9
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Junior Member
Join Date: Aug 2019
Posts: 10
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Relay Part Number
The part number shown on the package for that relay is A040G405.
Regards,
Chuck
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06-27-2022, 07:11 PM
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#10
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Senior Member
Join Date: Aug 2016
Location: Scottsdale, AZ
Posts: 3,122
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Quote:
Originally Posted by cokerstrom
The part number shown on the package for that relay is A040G405.
Regards,
Chuck
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Thanks for that info, Chuck. Fortunately, that's the same part number that's highlighted on the page from the Onan parts manual I posted above. I'll include that page again with this post.
__________________
Larry & Amy Beckner
Scottsdale, AZ
2022 Newmar Super Star 4061
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06-28-2022, 08:25 AM
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#11
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Senior Member
Entegra Owners Club Spartan Chassis
Join Date: Oct 2017
Posts: 2,208
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Thanks for the info.
I could not resist. I ordered one as a spare.
__________________
 Hal and Pam
2022 Entegra Cornerstone W
2020 Ford Edge ST
Sold 2017 Entegra Cornerstone B
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06-28-2022, 08:45 AM
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#12
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Senior Member
Entegra Owners Club
Join Date: Apr 2007
Location: SW FL
Posts: 32,394
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Googled the part number, $25.to $35. Cummins, $8.99 eBay. https://www.ebay.com/p/578981811 Good price for a carried spare.
__________________
Chuck in SW FL
Digital 2021 Cornerstone "B"
A "Digital" 2019 Cornerstone "B" Traded
A "Classic" 2014 Anthem 42 RBQ---Sold
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06-29-2022, 03:31 AM
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#13
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Senior Member
Entegra Owners Club
Join Date: Apr 2013
Location: Las Colinas, Texas
Posts: 2,099
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Received my spares yesterday - heading out Friday for New Mexico for some cooler weather.
__________________
Mark & Debra Wood, Las Colinas, TX.
2013 Entegra Aspire 42RBQ
2023 Jeep Wrangler Sahara 4XE
2013 Thor Challenger 37DT - Sold
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09-06-2024, 09:52 AM
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#14
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Junior Member
Join Date: Jul 2019
Posts: 7
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Onan seems to be out of this part...again...So I am looking for suitable alternatives.
One alternative is shown below with an ebay link: https://www.ebay.com/p/578981811
another one is: 12V 5 Pin Ignition Relay 307-2562 307-1886 A040G405
the same part is also on Amazon.
Has anyone had experience with either one?
thanks
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