| Onan 6K will not turn off. [message #345188] |
Fri, 12 July 2019 11:58  |
Gary M
Messages: 16
Registered: August 2018
Location: SW Virginia
Karma: 0
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Junior Member |
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I need a little help finding out where the wire on terminal 11 on the control board should correctly be placed. PO has it on the right side of the solenoid which causes the fuel pump to run when the battery is connected. This unit runs great now that the carb float is set right but will not cut off unless you disconnect the battery.
I am not great at following wiring diagrams.
All help appreciated.
77 Royale
455
Rear bath, SW Virginia
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| Re: [GMCnet] Onan 6K will not turn off. [message #345206 is a reply to message #345188] |
Fri, 12 July 2019 22:02  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Gary,
Terminal 11 SHOULD be attached continuously to +12 VDC. But that voltage
should reach the ignition coil and the fuel pump only through the NO
contacts of relay K3. And those contacts should open when either STOP
switch is depressed, bypassing the coil of K3 and allowing the NO contacts
to open.
Unless something really strange has happened, you have a frozen K3 on your
control board.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, Troy-Bilt APU, etc., etc., etc.
www.gmcwipersetc.com
On Fri, Jul 12, 2019 at 12:59 PM Gary M via Gmclist
wrote:
> I need a little help finding out where the wire on terminal 11 on the
> control board should correctly be placed. PO has it on the right side of the
> solenoid which causes the fuel pump to run when the battery is connected.
> This unit runs great now that the carb float is set right but will not cut
> off unless you disconnect the battery.
>
> I am not great at following wiring diagrams.
>
> All help appreciated.
> --
> 77 Royale
> 455
> Rear bath, SW Virginia
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
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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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| Re: [GMCnet] Onan 6K will not turn off. [message #345207 is a reply to message #345203] |
Fri, 12 July 2019 22:11 |
Gary M
Messages: 16
Registered: August 2018
Location: SW Virginia
Karma: 0
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Junior Member |
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There is only one wire at terminal 11 and it was attached to the battery side of the solenoid. I have no problems starting the unit with the switch but it will not shut off until I unhook the battery. When I hook the battery up it turns on the fuel pump before I touch the start switch.
77 Royale
455
Rear bath, SW Virginia
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| Re: [GMCnet] Onan 6K will not turn off. [message #345214 is a reply to message #345207] |
Sat, 13 July 2019 06:35 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Gary,
I think you'll find a short to ground in the Start wire (Green) to the
remote switch. To verify that WAG, disconnect the 4-pin connector near the
control board and measure the resistance of that lead to ground.
Ken H.
On Fri, Jul 12, 2019 at 11:22 PM Gary M via Gmclist
wrote:
> There is only one wire at terminal 11 and it was attached to the battery
> side of the solenoid. I have no problems starting the unit with the switch
> but it will not shut off until I unhook the battery. When I hook the
> battery up it turns on the fuel pump before I touch the start switch.
> --
> 77 Royale
> 455
> Rear bath, SW Virginia
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
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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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| Re: [GMCnet] Onan 6K will not turn off. [message #345218 is a reply to message #345214] |
Sat, 13 July 2019 08:49 |
Gary M
Messages: 16
Registered: August 2018
Location: SW Virginia
Karma: 0
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Junior Member |
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Ken,
This unit is a Royale and there are no colored wires going to the control panel, all are off white looking. In the operator's manual it shows that the #3 terminal is the start wire. I get no reading when testing this wire to ground. I do get 15.6 to 19.8 when testing the #1 terminal wire to ground.
If there is a short in the start wire for the remote if I leave the remote wires off and start the generator it should turn off with the switch on the generator itself, correct?
I do recall that when I bought this unit the PO said he burnt a wire behind the starter when he tried welding the starter bracket that had broke. That bracket and starter bushing have been replaced after I purchased it. The wire that he repaired was going to the choke.
77 Royale
455
Rear bath, SW Virginia
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| Re: [GMCnet] Onan 6K will not turn off. [message #345222 is a reply to message #345218] |
Sat, 13 July 2019 09:59 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Gary,
It sounds as if you have eliminated a short in the starter wire as your
problem, but you're right, starting the Onan with the plug disconnected
would be a double check on my WAG.
You may want to take a look at the Onan wiring diagram I re-drew years ago
for better clarity/understandability:
http://www.gmcmhphotos.com/photos/kh-onan-wiring-170725/p63486-kh-onan-wiring-170725.html
If you look down the right side of that diagram, you'll see Blue (Bu),
Green (Gn), Orange (Or), and Grey (Gy) wire labels. I should have marked
the connector for those 4 wires, because that's the ones you're
disconnecting. As you can see, when that's disconnected, there is no
longer any connection to the Ignition and Fuel Pump except through the NO
contacts of K3. That seems to confirm that those contacts are welded
shut. You might try tapping on its case, or even, as a last resort,
removing its cover to determine whether its points can open.
HTH,
Ken H.
On Sat, Jul 13, 2019 at 9:50 AM Gary M via Gmclist
wrote:
> Ken,
>
> This unit is a Royale and there are no colored wires going to the control
> panel, all are off white looking. In the operator's manual it shows that the
> #3 terminal is the start wire. I get no reading when testing this wire to
> ground. I do get 15.6 to 19.8 when testing the #1 terminal wire to ground.
>
> If there is a short in the start wire for the remote if I leave the remote
> wires off and start the generator it should turn off with the switch on the
> generator itself, correct?
>
> I do recall that when I bought this unit the PO said he burnt a wire
> behind the starter when he tried welding the starter bracket that had
> broke. That
> bracket and starter bushing have been replaced after I purchased it. The
> wire that he repaired was going to the choke.
> --
> 77 Royale
> 455
> Rear bath, SW Virginia
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Onan 6K will not turn off. [message #345223 is a reply to message #345222] |
Sat, 13 July 2019 10:30 |
Gary M
Messages: 16
Registered: August 2018
Location: SW Virginia
Karma: 0
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Junior Member |
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Ken,
It does look like I need to order a new board for it. I crossed terminal #1 and #2 with remote terminals unhooked and it still would not shut down. It currently has a Flight Systems board on it. What would be your recommendation on which board to replace with?
Thanks for your help!
77 Royale
455
Rear bath, SW Virginia
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| Re: [GMCnet] Onan 6K will not turn off. [message #345231 is a reply to message #345223] |
Sat, 13 July 2019 11:16 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Just to be sure about your test: You say you connected terminals 1 & 2,
but I don't have any reference telling me the connection of those terminals
so I don't know the result. I do know that if you disconnect the 4-pin
plug, the switch on the control board should remain effective for both
starting and starting -- barring a problem on the board.
I have no experience with the Flight Systems board, but I've always heard
good things about them and the company's support. I'd talk to them about
your current board and problem. For that matter, I haven't really had any
Onan experience since I replaced mine with a Generac in '07 -- and that
with a TroyBilt in '09 (which is still running flawlessly, 'tho' noisily).
Ken H.
On Sat, Jul 13, 2019 at 11:31 AM Gary M via Gmclist
wrote:
> Ken,
>
> It does look like I need to order a new board for it. I crossed terminal
> #1 and #2 with remote terminals unhooked and it still would not shut down.
> It
> currently has a Flight Systems board on it. What would be your
> recommendation on which board to replace with?
>
> Thanks for your help!
> --
> 77 Royale
> 455
> Rear bath, SW Virginia
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Onan 6K will not turn off. [message #345233 is a reply to message #345218] |
Sat, 13 July 2019 11:32 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Sir: IIRC the S-1 (starter solenoid) has a 12volt when cranking only wire going to the fuel pump and ignition to initially start the Onan. If the PO has this wire on the wrong terminal of S-1 it will stay running?? I have seen the S-1 solenoid go bad internally and not give 12v to the small terminal while engaging starter. The repair is to replace solenoid or move the wire off the small terminal to the big 12volt output side going to starter. This may not be your problem but is something to check since PO did repair a wire behind starter.
Gary M wrote on Sat, 13 July 2019 09:49Ken,
This unit is a Royale and there are no colored wires going to the control panel, all are off white looking. In the operator's manual it shows that the #3 terminal is the start wire. I get no reading when testing this wire to ground. I do get 15.6 to 19.8 when testing the #1 terminal wire to ground.
If there is a short in the start wire for the remote if I leave the remote wires off and start the generator it should turn off with the switch on the generator itself, correct?
I do recall that when I bought this unit the PO said he burnt a wire behind the starter when he tried welding the starter bracket that had broke. That bracket and starter bushing have been replaced after I purchased it. The wire that he repaired was going to the choke.
C. Boyd
76 Crestmont
East Tennessee
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