| Onan [message #288111] |
Thu, 01 October 2015 18:53  |
Bill Shourt
Messages: 33
Registered: January 2005
Location: Sherman Oaks ,Ca
Karma: 0
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A couple of months ago I replaced my circuit board with a dino board from Jim K but my starter would stay engaged about one time in ten that I tried it. If I pulled the lead to the starter solenoid it would disengage. I checked that wire after I pulled it off and there was no voltage. I next replaced the K1 starting relay with a new one. same thing happens. I have been using the coach quite a bit this summer so I ran a line inside the coach with a switch between K1 and the starter solenoid so I can disengage the starter if it stays going (about 10,000 rpm ?). Not the solution I want.
It will happen from inside switch as well as Onan start switch. I am baffled . Thanks for any thoughts form the group.
Bill and Michele Shourt
78 Kingsley, origional
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| Re: Onan [message #288113 is a reply to message #288111] |
Thu, 01 October 2015 20:47  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Have you cleaned or bypassed the Molex type connector back by the Onan feeding the remote panel inside? Green corosion can be partly conductive and give the unit the impression the switch is closed inside
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Onan [message #288135 is a reply to message #288112] |
Fri, 02 October 2015 17:22 |
William Shourt
Messages: 35
Registered: August 2015
Karma: 0
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Larry the starter disengages when I pull off the wire from the K1 starting relay so the problem seems to be somehow electrically related. I love my Onan and it has been fault free for the twenty one years that I have had it.
Sent from my iPad
> On Oct 1, 2015, at 5:07 PM, Larry Davick wrote:
>
> The same thing would happen to me until I installed the Ragusa bracket. My old bracket looked okay to me - no visible cracks - but it must have bent or something. Now the starter engages perfectly.
>
> Larry Davick
> A Mystery Machine
> 1976(ish) Palm Beach
> Fremont, CA
> Howell EFI + EBL + Electronic Distributor
>
>> On Oct 1, 2015, at 4:53 PM, Bill Shourt wrote:
>>
>> A couple of months ago I replaced my circuit board with a dino board from Jim K but my starter would stay engaged about one time in ten that I tried
>> it. If I pulled the lead to the starter solenoid it would disengage. I checked that wire after I pulled it off and there was no voltage. I next
>> replaced the K1 starting relay with a new one. same thing happens. I have been using the coach quite a bit this summer so I ran a line inside the
>> coach with a switch between K1 and the starter solenoid so I can disengage the starter if it stays going (about 10,000 rpm ?). Not the solution I
>> want.
>> It will happen from inside switch as well as Onan start switch. I am baffled . Thanks for any thoughts form the group.
>> --
>> Bill and Michele Shourt
>> 78 Kingsley, origional
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| Re: Onan [message #288150 is a reply to message #288111] |
Sat, 03 October 2015 10:25 |
LarryInSanDiego
Messages: 336
Registered: September 2006
Karma: 0
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I bought a used 6K Onan a few years back and the starter sounded awful. Ragusa lists only one starter bracket. Does the same bracket fit both the 4K and 6K?
Larry Engelbrecht
San Diego, CA
'73 26' ex-Glacier
TZE063V100319 03/07/73
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| Re: Onan [message #288151 is a reply to message #288111] |
Sat, 03 October 2015 11:40 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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I had the same problem with my dino board. If I recall, I wired a jumper between the two pins that you jumper to test run the unit (that disables the low oil cutoff switch) and put in a diode so it would only be engaged when the starter button was pressed. I recall my thinking was that the board was not sensing the unit was making power yet so stayed engaged? Solved the problem and the low oil pressure cutoff switch still worked. Sorry for the vague description but I do not recall what pins (there is a tutorial out there or someone will pipe in here).
Probably a sneak path somewhere in the dino board that caused this. Yeah, a shorted Capacitor may do this. I no longer have the coach, so cannot share any more details.
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: [GMCnet] Onan [message #288189 is a reply to message #288172] |
Sun, 04 October 2015 20:01 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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Senior Member |
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> On Oct 4, 2015, at 12:20 AM, William Shourt wrote:
>
> Terry the capacitor looked good, it's a new board. I was reading the manual again this morning and it said the board gets voltage from the alternator which switches off the K1 starting solenoid. Could be intermittent issue with the alternator or the rectifier. I had the same problem with the original board also.
Confirm that you have a solid ~28VAC coming out of the flywheel alternator and that this voltage is present at the appropriate control board terminals with the engine running. The control board uses this voltage to confirm that the engine has started - and once that confirmation occurs the control board will remove voltage from the starter solenoid.
Reference: Onan Service Manual
Page 32 describes the flywheel alternator test procedure. Note that the procedure refers to battery charging system…but the same alternator subsystem is fed to the control board as I described earlier. Your coach may or may not use the Onan battery charging system but that is not what we are discussing.
Page 45 paragraph 2 describes how the flywheel alternator voltage is used to disengage the starter solenoid.
Page 46 schematic shows the flywheel alternator as G1.
Since you have a new control board it is probably not time to be going after out-of-tolerance/failed components on that board just yet.
--Jim "saving the lives of Onans...one unit at a time" Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] Onan [message #288256 is a reply to message #288189] |
Mon, 05 October 2015 20:32 |
William Shourt
Messages: 35
Registered: August 2015
Karma: 0
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Member |
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Jim thanks for the info, I started the Onan twenty times yesterday and ofcourse it worked perfectly every time. Going dry camping for a week or so and will have plenty of chances to check for the 28 VAC. I hate intermintent electrical problems. this thing has been rock solid for the 21 years that I have owned it so I can't complain.
On Oct 4, 2015, at 6:01 PM, Jim Miller wrote:
>> On Oct 4, 2015, at 12:20 AM, William Shourt wrote:
>>
>> Terry the capacitor looked good, it's a new board. I was reading the manual again this morning and it said the board gets voltage from the alternator which switches off the K1 starting solenoid. Could be intermittent issue with the alternator or the rectifier. I had the same problem with the original board also.
>
> Confirm that you have a solid ~28VAC coming out of the flywheel alternator and that this voltage is present at the appropriate control board terminals with the engine running. The control board uses this voltage to confirm that the engine has started - and once that confirmation occurs the control board will remove voltage from the starter solenoid.
>
> Reference: Onan Service Manual
>
> Page 32 describes the flywheel alternator test procedure. Note that the procedure refers to battery charging system…but the same alternator subsystem is fed to the control board as I described earlier. Your coach may or may not use the Onan battery charging system but that is not what we are discussing.
>
> Page 45 paragraph 2 describes how the flywheel alternator voltage is used to disengage the starter solenoid.
>
> Page 46 schematic shows the flywheel alternator as G1.
>
> Since you have a new control board it is probably not time to be going after out-of-tolerance/failed components on that board just yet.
>
> --Jim "saving the lives of Onans...one unit at a time" Miller
> 1977 Eleganza II
> 1977 Royale
> Hamilton, OH
>
>
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| Re: [GMCnet] Onan [message #288262 is a reply to message #288256] |
Mon, 05 October 2015 21:34 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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Senior Member |
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On Oct 5, 2015, at 9:32 PM, William Shourt wrote:
>
> Jim thanks for the info, I started the Onan twenty times yesterday and ofcourse it worked perfectly every time. Going dry camping for a week or so and will have plenty of chances to check for the 28 VAC. I hate intermintent electrical problems. this thing has been rock solid for the 21 years that I have owned it so I can't complain.
Intermittent problems are the worst of all to troubleshoot and fix without a doubt.
If you get desperate while you are dry camping just go into battle override mode and jumper battery + to coil + and start it up. That bypasses the control board entirely (and also the low oil pressure shutdown as well…so be advised).
--Jim "saving the lives of Onans...one unit at a time" Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| [GMCnet] Onan [message #288266 is a reply to message #288262] |
Tue, 06 October 2015 04:22 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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On Monday, October 5, 2015, Jim Miller wrote:
> On Oct 5, 2015, at 9:32 PM, William Shourt wrote:
>>
>> Jim thanks for the info, I started the Onan twenty times yesterday and
> ofcourse it worked perfectly every time. Going dry camping for a week or so
> and will have plenty of chances to check for the 28 VAC. I hate
> intermintent electrical problems. this thing has been rock solid for the
> 21 years that I have owned it so I can't complain.
>
> Intermittent problems are the worst of all to troubleshoot and fix without
> a doubt.
>
>
As jim says
> If you get desperate while you are dry camping just go into battle
> override mode and jumper battery + to coil + and start it up. That bypasses
> the control board entirely (and also the low oil pressure shutdown as
> well…so be advised).
>
> --Jim "saving the lives of Onans...one unit at a time" Miller
Read here for all,the facts
http://www.bdub.net/manuals/onanmanual.pdf
Which is jim b says, is using the - prime - switch a toggle switch -
Leave on in emergencies
Read here
http://gmcws.org/blog/?p=3765
1977 Eleganza II
> 1977 Royale
> Hamilton, OH
>
>
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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