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Re: [GMCnet] Bringing Onan back to life due to impending hurricane [message #185524 is a reply to message #185499]

Sun, 23 September 2012 22:03

Ken Henderson

Messages: 8726
Registered: March 2004
Location: Americus, GA

Karma:

Senior Member

Robin,

Jumping 5 to 9 completely bypasses the control board and provides power to
the ignition coil, the fuel solenoid, and the fuel pump. So you need no
other jumper to get the engine running -- IF everything up to the control
board is correct. So, before you jump 5 to 9, connect a test lamp from 9
(or the terminal on the ignition coil to which 9 is connected) to ground.
If that lamp illuminates when 5 is connected to 9, all up to there is OK
for your testing -- you can remove the lamp.

You may find the diagram here easier to follow than those in the manual.
Ignore the label "4 kW" -- 6 kW is identical; there are other minor
changes to match the Onan I had at the time, but they should confuse most
issues.
http://www.gmcmhphotos.com/photos/data/5813/KH_Onan_Wiring1.pdf
or
http://goo.gl/lS09C

The only really essential function of the control board is to monitor oil
pressure. Its other major function is to ensure that you don't engage the
starter when the engine's running; if you can't handle that chore yourself,
I'm afraid we can't help you.

As others have said, don't waste good money on exorbitant Cummins service
charges, nor on parts which you don't need or may be sub-optimal (such as
any ignition upgrade other than Pertronix). The Onan is too simple a
device to let it throw you -- yet. (One must remember that I finally gave
up on Onan, but not because there was ever anything on it I couldn't fix.)

Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI+ & EBL
www.gmcwipersetc.com

On Sun, Sep 23, 2012 at 6:45 PM, Robin Hood wrote:

> I didn't realize that there was a way to completely bypass the control
> board (that does several important things so obviously one should only
> bypass for troubleshooting reasons). So how does one bypass the board
> completely? I need to see if I can narrow down the cause of my
> no-spark condition.
>
> All I've seen so far is that 9to5 runs the pump. But the ignition
> system also needs juice.
>
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach

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[Message index]

		[GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 12:06
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 12:28
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Mon, 27 August 2012 12:58
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: lqqkatjon on Mon, 27 August 2012 13:00
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 13:07
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: mike miller on Mon, 27 August 2012 13:43
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Mon, 27 August 2012 14:21
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: mickeysss on Mon, 27 August 2012 17:38
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 19:01
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 19:50
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: powerjon on Mon, 27 August 2012 20:07
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 20:15
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: powerjon on Mon, 27 August 2012 20:26
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 20:31
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: USAussie on Mon, 27 August 2012 21:43
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 21:58
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: sgltrac on Mon, 27 August 2012 22:12
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: powerjon on Mon, 27 August 2012 20:34
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Mon, 27 August 2012 20:31
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: midlf on Mon, 27 August 2012 20:44
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 21:47
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Mon, 27 August 2012 23:59
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Tue, 28 August 2012 00:20
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: sgltrac on Tue, 28 August 2012 00:35
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: k2gkk on Tue, 28 August 2012 08:10
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Tue, 28 August 2012 08:24
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: USAussie on Tue, 28 August 2012 11:16
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Tue, 28 August 2012 11:27
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: USAussie on Tue, 28 August 2012 11:32
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: mickeysss on Tue, 28 August 2012 13:10
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Tue, 28 August 2012 13:22
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Tue, 28 August 2012 11:43
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: A Hamilto on Tue, 28 August 2012 11:51
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: hal kading on Tue, 28 August 2012 11:38
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: A Hamilto on Mon, 27 August 2012 22:28
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: sgltrac on Mon, 27 August 2012 22:37
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: A Hamilto on Mon, 27 August 2012 23:00
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Mon, 27 August 2012 20:28
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: lqqkatjon on Mon, 27 August 2012 13:45
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: sgltrac on Mon, 27 August 2012 22:07
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: JohnL455 on Tue, 28 August 2012 15:01
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sat, 01 September 2012 07:58
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: USAussie on Sat, 01 September 2012 09:10
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: mike miller on Sat, 01 September 2012 19:26
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: USAussie on Sat, 01 September 2012 21:38
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sat, 01 September 2012 21:40
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Fri, 14 September 2012 10:21
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Ken Henderson on Fri, 14 September 2012 12:41
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sat, 22 September 2012 16:17
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: powerjon on Sat, 22 September 2012 16:32
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sat, 22 September 2012 17:18
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: James Hupy on Sat, 22 September 2012 17:20
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 23 September 2012 10:30
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: James Hupy on Sun, 23 September 2012 11:07
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 23 September 2012 11:11
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: James Hupy on Sun, 23 September 2012 13:20
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: mike miller on Sun, 23 September 2012 15:55
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 23 September 2012 17:45
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: James Hupy on Sun, 23 September 2012 18:04
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Ken Henderson on Sun, 23 September 2012 22:03
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: mike miller on Sun, 23 September 2012 22:11
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 14 October 2012 08:59
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Ken Henderson on Sun, 14 October 2012 09:12
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 14 October 2012 09:22
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Ken Henderson on Sun, 14 October 2012 10:29
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 14 October 2012 11:00
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 14 October 2012 14:24
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Ken Henderson on Sun, 14 October 2012 15:44
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 14 October 2012 21:16
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 14 October 2012 09:15
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Ken Henderson on Sun, 14 October 2012 09:17

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