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Re: [GMCnet] ONAN starting [message #320863 is a reply to message #320859] Sat, 22 July 2017 22:51 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
Bill,

You're absolutely correct: My latest version is WRONG! I guess when I
looked at the OEM diagram and eliminated the Voltage Regulator, I ignored
that the SCR in the VR was isolating that point from ground.

I'll revise and publish that tomorrow. Gosh, I hope that's the last one!
I think my four score years mean I should give up this sort of thing. :-(
Y'All keep looking for errors -- and consider assuming this task.

Ken H.


On Sat, Jul 22, 2017 at 9:32 PM, Bill Wevers wrote:

> Mr. Henderson,
> I believe your original schematic was correct, with respect to Pin 8.
> When I look at PIN 8 on my Onan board, it does not connect to GND.
> That's the 30V generator output being rectified by CR1 and filtered by R1
> C1.
>
> Regards,
> Bill
>
> --
> Bill Wevers GMC49ers, GMC Western States
> 1975 Glenbrook - Manny Powerdrive, OneTon
> 455 F Block, G heads
> San Jose
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: [GMCnet] ONAN starting [message #320885 is a reply to message #320863] Sun, 23 July 2017 09:53 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
OK, I've removed the erroneous ground connection from Pin 8. The revised
diagram is here:

https://drive.google.com/file/d/0B3XquSIYjDleeFphNGM1OXZKd1k/view?usp=sharing

Eventually I'll get that version "KH Onan Wiring 170723" onto GMCMHPhotos
to replace "KH Onan Wiring 170604", but I'm having trouble right now.

Ken H.


On Sat, Jul 22, 2017 at 11:51 PM, Ken Henderson
wrote:

> Bill,
>
> You're absolutely correct: My latest version is WRONG! I guess when I
> looked at the OEM diagram and eliminated the Voltage Regulator, I ignored
> that the SCR in the VR was isolating that point from ground.
>
> I'll revise and publish that tomorrow. Gosh, I hope that's the last one!
> I think my four score years mean I should give up this sort of thing. :-(
> Y'All keep looking for errors -- and consider assuming this task.
>
> Ken H.
>
>
> On Sat, Jul 22, 2017 at 9:32 PM, Bill Wevers wrote:
>
>> Mr. Henderson,
>> I believe your original schematic was correct, with respect to Pin 8.
>> When I look at PIN 8 on my Onan board, it does not connect to GND.
>> That's the 30V generator output being rectified by CR1 and filtered by R1
>> C1.
>>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: ONAN starting [message #320908 is a reply to message #320793] Sun, 23 July 2017 16:34 Go to previous messageGo to next message
JohnL455 is currently offline  JohnL455   United States
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
Senior Member
Don't feel bad Ken H. Still a lot less mistakes than in most GM factory manuals.

John Lebetski
Woodstock, IL
77 Eleganza II
Re: ONAN starting [message #320909 is a reply to message #320793] Sun, 23 July 2017 16:38 Go to previous messageGo to next message
JohnL455 is currently offline  JohnL455   United States
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
Senior Member
Don't feel bad Ken H. Still a lot less mistakes than in most GM factory manuals.

John Lebetski
Woodstock, IL
77 Eleganza II
Re: [GMCnet] ONAN starting [message #320914 is a reply to message #320885] Sun, 23 July 2017 18:17 Go to previous messageGo to next message
William Shourt is currently offline  William Shourt   United States
Messages: 35
Registered: August 2015
Karma: 0
Member
Ken B, sorry i was not able to get back sooner. I am taking readings at the N/O point of K1 that goes to starter and the choke. That wire goes to 8VDC when the engine starts running, from 12.5 VDC and drops to 0 when wire removed from starter and starter disengages.
> On Jul 23, 2017, at 7:53 AM, Ken Henderson wrote:
>
> OK, I've removed the erroneous ground connection from Pin 8. The revised
> diagram is here:
>
> https://drive.google.com/file/d/0B3XquSIYjDleeFphNGM1OXZKd1k/view?usp=sharing
>
> Eventually I'll get that version "KH Onan Wiring 170723" onto GMCMHPhotos
> to replace "KH Onan Wiring 170604", but I'm having trouble right now.
>
> Ken H.
>
>
> On Sat, Jul 22, 2017 at 11:51 PM, Ken Henderson
> wrote:
>
>> Bill,
>>
>> You're absolutely correct: My latest version is WRONG! I guess when I
>> looked at the OEM diagram and eliminated the Voltage Regulator, I ignored
>> that the SCR in the VR was isolating that point from ground.
>>
>> I'll revise and publish that tomorrow. Gosh, I hope that's the last one!
>> I think my four score years mean I should give up this sort of thing. :-(
>> Y'All keep looking for errors -- and consider assuming this task.
>>
>> Ken H.
>>
>>
>> On Sat, Jul 22, 2017 at 9:32 PM, Bill Wevers wrote:
>>
>>> Mr. Henderson,
>>> I believe your original schematic was correct, with respect to Pin 8.
>>> When I look at PIN 8 on my Onan board, it does not connect to GND.
>>> That's the 30V generator output being rectified by CR1 and filtered by R1
>>> C1.
>>>
>>
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Re: ONAN starting [message #320929 is a reply to message #320909] Sun, 23 July 2017 21:17 Go to previous messageGo to next message
Ken Burton is currently offline  Ken Burton   United States
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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Senior Member
I have been looking at Ken H's wiring diagram. Someone is going to have to explain to me how the starter solenoid / relay works as shown. I see 2 coils labeled only as K It seems to me that the lower (right) coil would be energized by K1 and in turn would close the K contact to power the starter.

What confuses me is the other K coil (wired vertically in the diagram). It appears to me when voltage to the K solenoid from k1 is dropped, then the to two solenoid K coils are now in series with +12 and power is being applied by the closed K N/O contact. If this is true, we would have some voltage other than +12 or 0 at the K1 N/0 contact that he is reading.

What am I missing here?

Do we have a diode missing in the diagram?

Is the diagram wrong?

Ken B.


Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
Re: [GMCnet] ONAN starting [message #320942 is a reply to message #320929] Sun, 23 July 2017 23:09 Go to previous messageGo to next message
William Shourt is currently offline  William Shourt   United States
Messages: 35
Registered: August 2015
Karma: 0
Member
Need to think on that one. Have Onan drawing here somewhere. Will dig.

Sent from my iPad

> On Jul 23, 2017, at 7:17 PM, Ken Burton wrote:
>
> I have been looking at Ken H's wiring diagram. Someone is going to have to explain to me how the starter solenoid / relay works as shown. I see 2
> coils labeled only as K It seems to me that the lower (right) coil would be energized by K1 and in turn would close the K contact to power the
> starter.
>
> What confuses me is the other K coil (wired vertically in the diagram). It appears to me when voltage to the K solenoid from k1 is dropped, then the
> to two solenoid K coils are now in series with +12 and power is being applied by the closed K N/O contact. If this is true, we would have some
> voltage other than +12 or 0 at the K1 N/0 contact that he is reading.
>
> What am I missing here?
>
> Do we have a diode missing in the diagram?
>
> Is the diagram wrong?
>
> Ken B.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
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Re: [GMCnet] ONAN starting [message #320943 is a reply to message #320929] Sun, 23 July 2017 23:35 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
Ken,

I don't pretend to understand the two K coils shown either. But that's
Onan's doings, not mine! I just double checked and I copied that weirdness
directly -- all the way back to 2001.

The only way I can rationalize it is if neither coil can hold the solenoid
contacts closed alone. I'm guessing that the coil in series with the motor
creates just enough contact to activate the parallel coil, which then
firmly closes the contact. When K1 opens, the loss of the series current
allows the contacts to open again. Possibly some sort of arc suppression
scheme? Sort of like the little jumper wire from the + side of K1 to its
contact disc. Duane and I never could figure out any reason for that one
either, except maybe to make it a proprietary part.

I guess someone needs to disassemble and do some tests on an Onan starter,
huh?

Ken H.


On Sun, Jul 23, 2017 at 10:17 PM, Ken Burton wrote:

> I have been looking at Ken H's wiring diagram. Someone is going to have
> to explain to me how the starter solenoid / relay works as shown. I see 2
> coils labeled only as K It seems to me that the lower (right) coil would
> be energized by K1 and in turn would close the K contact to power the
> starter.
>
> What confuses me is the other K coil (wired vertically in the diagram).
> It appears to me when voltage to the K solenoid from k1 is dropped, then the
> to two solenoid K coils are now in series with +12 and power is being
> applied by the closed K N/O contact. If this is true, we would have some
> voltage other than +12 or 0 at the K1 N/0 contact that he is reading.
>
> What am I missing here?
>
> Do we have a diode missing in the diagram?
>
> Is the diagram wrong?
>
> Ken B.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: ONAN starting about 2 K windings [message #320962 is a reply to message #320929] Mon, 24 July 2017 09:28 Go to previous messageGo to next message
Matt Colie is currently offline  Matt Colie   United States
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
Senior Member
Ken Burton wrote on Sun, 23 July 2017 22:17
I have been looking at Ken H's wiring diagram. Someone is going to have to explain to me how the starter solenoid / relay works as shown. I see 2 coils labeled only as K It seems to me that the lower (right) coil would be energized by K1 and in turn would close the K contact to power the starter.

What confuses me is the other K coil (wired vertically in the diagram). It appears to me when voltage to the K solenoid from k1 is dropped, then the to two solenoid K coils are now in series with +12 and power is being applied by the closed K N/O contact. If this is true, we would have some voltage other than +12 or 0 at the K1 N/0 contact that he is reading.

What am I missing here?

Do we have a diode missing in the diagram?

Is the diagram wrong?

Ken B.


Kens et al....

The diagram is accurate. But I just read my explanation twice and I don't understand it so we are going to add something.
Print the picture:
Mark the contacts inside the solenoid Ks.
Mark the K winding in the vertical Kh.
Mark the K winding in the Horizontal Kl.

This is the way starter solenoids are built. The vertical Kh is a very high current winding that is essentially in series with the starter motor until the contact Ks closes. Then it is by-passed. That leaves the horizontal Kl winding to hold the contacts while the starter is cranking. If you disconnect the starter from the solenoid, the horizontal Kl winding may not have enough power along to pull the Ks contacts and make the machine crank. So, the Kh winging gets full battery until Ks closes. Then it is by-passed.

I hope I explained that well enough.

If the Kh winding goes bad, the solenoid will often not make at all, but it will draw current.
If the Kl winding goes bad, the solenoid will chatter (and battery voltage looks good?).

Care to guess how I learned all about this???

Matt


Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
Re: [GMCnet] ONAN starting about 2 K windings [message #320994 is a reply to message #320962] Mon, 24 July 2017 13:26 Go to previous messageGo to next message
William Shourt is currently offline  William Shourt   United States
Messages: 35
Registered: August 2015
Karma: 0
Member
Matt and Ken I have read this several times and i am not able to get my head around what you are saying, I plead old age.
I just tried it again but this time I read the voltage at the start solenoid where the wire from K1 hooks on. When the starter is cranking 12.5 volts, engine starts, starter keeps running and meter shows 8.3 volts. When I disconnect wire at K1 voltage drops to 0 and starter disengages.
Do you think that the 8.3 volts is leaking from the board-K1 side or the starter side or ???

> On Jul 24, 2017, at 7:28 AM, Matt Colie wrote:
>
> Ken Burton wrote on Sun, 23 July 2017 22:17
>> I have been looking at Ken H's wiring diagram. Someone is going to have to explain to me how the starter solenoid / relay works as shown. I see
>> 2 coils labeled only as K It seems to me that the lower (right) coil would be energized by K1 and in turn would close the K contact to power the
>> starter.
>>
>> What confuses me is the other K coil (wired vertically in the diagram). It appears to me when voltage to the K solenoid from k1 is dropped, then
>> the to two solenoid K coils are now in series with +12 and power is being applied by the closed K N/O contact. If this is true, we would have some
>> voltage other than +12 or 0 at the K1 N/0 contact that he is reading.
>>
>> What am I missing here?
>>
>> Do we have a diode missing in the diagram?
>>
>> Is the diagram wrong?
>>
>> Ken B.
>
>
> Kens et al....
>
> The diagram is accurate. But I just read my explanation twice and I don't understand it so we are going to add something.
> Print the picture:
> Mark the contacts inside the solenoid Ks.
> Mark the K winding in the vertical Kh.
> Mark the K winding in the Horizontal Kl.
>
> This is the way starter solenoids are built. The vertical Kh is a very high current winding that is essentially in series with the starter motor
> until the contact Ks closes. Then it is by-passed. That leaves the horizontal Kl winding to hold the contacts while the starter is cranking. If you
> disconnect the starter from the solenoid, the horizontal Kl winding may not have enough power along to pull the Ks contacts and make the machine
> crank. So, the Kh winging gets full battery until Ks closes. Then it is by-passed.
>
> I hope I explained that well enough.
>
> If the Kh winding goes bad, the solenoid will often not make at all, but it will draw current.
> If the Kl winding goes bad, the solenoid will chatter (and battery voltage looks good?).
>
> Care to guess how I learned all about this???
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
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Re: [GMCnet] ONAN starting about 2 K windings [message #321015 is a reply to message #320994] Mon, 24 July 2017 20:56 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
William,

It's about as much of a WAG as anything else, but at least it's based on a
little-known fact:

When you say you measure "at the start solenoid where the wire from K1
hooks on", I take it to mean at terminal "S" on the diagram and the
solenoid. Correct?

If so, and disconnecting at K1 means disconnecting the wire leading to "S",
then my hypothesis could be correct.

Unlike any other solenoid relay I've ever seen, the K1 relay has an
internal flexible (woven) jumper wire from one of its control terminals to
the main contact disc which makes the connection between the battery
terminals. That jumper does not appear on any Onan drawing I've seen, but
I added it to my re-drawn version. You can see it as a very thin line on
"KH Onan Wiring 170723". My hypothesis is that due to an internal failure
of some sort, that jumper is continuing to conduct after KI is
"disengaged". Since it's a small wire, it has a much higher resistance
than the main contacts, so only partial voltage is applied to the starter
solenoid, but enough to keep the already-engaged starter solenoid closed.

I'd start by measuring the open circuit resistance across the K1 relay's
main contacts. Then, I'd probably disassemble that relay, as I did to
learn of the jumper back in 2000 or so, to see if everything's kosher
inside.

Rots a Ruck!

Ken H.
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: [GMCnet] ONAN starting about 2 K windings [message #321031 is a reply to message #321015] Mon, 24 July 2017 23:15 Go to previous messageGo to next message
Bullitthead is currently offline  Bullitthead   United States
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Registered: November 2013
Karma: 5
Senior Member
I guess since they configured the solenoid the same way that pinball flipper solenoids are setup they anticipated you would be cranking for an extended period Laughing

Terry Kelpien ASE Master Technician 73 Glacier 260 Smithfield, Va.
Re: ONAN starting about 2 K windings [message #321032 is a reply to message #320962] Mon, 24 July 2017 23:19 Go to previous messageGo to next message
Ken Burton is currently offline  Ken Burton   United States
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
Senior Member
I think that I understand Matt's posting on how this is suppose to work.

Ken H,

What I think you are saying is that the K1 contact is indeed 2 contacts with a common bar or disc shorting across them when the coil is energized. In your scenario I believe you are stating that the right side only (and not the left) contact fails to break when power is removed from the K1 coil. So the circuit travels through the internal K1 wire and the right side contact.

I'm still thinking about other possibilities:

1. The electric choke or the horizontal wired K coil. I see a possible path to ground for the vertical wired K coil if the choke or horizontal K coil has an internal partial short to ground.

2. The vertically wired K coil could possibly cause the same thing to the horizontal K if it had an internal short.

3. Is there a wiring error or partial short to +12 v on the wire going to the electric choke.

None of my above scenarios explains why the starter stops when the wire on terminal S is removed. This fact leads more to your explanation being the correct one.


Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
Re: [GMCnet] ONAN starting about 2 K windings [message #321034 is a reply to message #321031] Mon, 24 July 2017 23:23 Go to previous messageGo to next message
William Shourt is currently offline  William Shourt   United States
Messages: 35
Registered: August 2015
Karma: 0
Member
Ken I will check that out, hell at this point I will try anything.
Terry thanks for giving me a laugh.


Sent from my iPad

> On Jul 24, 2017, at 9:15 PM, Terry wrote:
>
> I guess since they configured the solenoid the same way that pinball flipper solenoids are setup they anticipated you would be cranking for an
> extended period :lol:
> --
> Terry Kelpien
>
> ASE Master Technician
>
> 73 Glacier 260
>
> Smithfield, Va.
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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Re: ONAN starting [message #321035 is a reply to message #320793] Tue, 25 July 2017 00:22 Go to previous messageGo to next message
bwevers is currently offline  bwevers   United States
Messages: 597
Registered: October 2010
Location: San Jose
Karma: 5
Senior Member
Just a thought.
You say you have 33 volts at pin 8 when running.
Can you check the voltage at CR1 and capacitor C1 to see if it's rectifying the 33 volts?
The Dino boards have been known to burn up that R1 resistor.
The original Onan board I have has a 200ohm resistor for R1.
Someone here said the Dino boards have a smaller value, lower wattage resistor.


Bill Wevers GMC49ers, GMC Western States 1975 Glenbrook - Manny Powerdrive, OneTon 455 F Block, G heads San Jose
Re: [GMCnet] ONAN starting [message #321036 is a reply to message #320885] Tue, 25 July 2017 00:51 Go to previous messageGo to next message
Guy Lopes is currently offline  Guy Lopes   United States
Messages: 499
Registered: April 2004
Location: Sacramento, CA
Karma: 3
Senior Member
Thanks Ken!

Is your Son still selling the large format wiring diagrams?

Guy Lopes
76 RB Birchaven
Sacramento, CA



-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Ken
Henderson
Sent: Sunday, July 23, 2017 7:53 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] ONAN starting

OK, I've removed the erroneous ground connection from Pin 8. The revised
diagram is here:

https://drive.google.com/file/d/0B3XquSIYjDleeFphNGM1OXZKd1k/view?usp=sharin
g

Eventually I'll get that version "KH Onan Wiring 170723" onto GMCMHPhotos to
replace "KH Onan Wiring 170604", but I'm having trouble right now.

Ken H.


On Sat, Jul 22, 2017 at 11:51 PM, Ken Henderson
wrote:

> Bill,
>
> You're absolutely correct: My latest version is WRONG! I guess when
> I looked at the OEM diagram and eliminated the Voltage Regulator, I
> ignored that the SCR in the VR was isolating that point from ground.
>
> I'll revise and publish that tomorrow. Gosh, I hope that's the last one!
> I think my four score years mean I should give up this sort of thing.
> :-( Y'All keep looking for errors -- and consider assuming this task.
>
> Ken H.
>
>
> On Sat, Jul 22, 2017 at 9:32 PM, Bill Wevers wrote:
>
>> Mr. Henderson,
>> I believe your original schematic was correct, with respect to Pin 8.
>> When I look at PIN 8 on my Onan board, it does not connect to GND.
>> That's the 30V generator output being rectified by CR1 and filtered
>> by R1 C1.
>>
>
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Guy Lopes 76 Birchaven "Orion" Sacramento, CA W6TOL www.GMC-Guy.com
Re: ONAN starting about 2 K windings [message #321037 is a reply to message #321032] Tue, 25 July 2017 01:15 Go to previous messageGo to next message
Ken Burton is currently offline  Ken Burton   United States
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
Senior Member
If the failing component is as Colonel Ken is suggesting, what About removing the internal jumper inside the solenoid? I do not see how that would hurt anything. I would not try it without Colonel Ken's blessing unless it can be easily reinstalled. I have no idea as I have never seen it.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
Re: [GMCnet] ONAN starting [message #321039 is a reply to message #321036] Tue, 25 July 2017 05:59 Go to previous messageGo to next message
Bruce Hart is currently offline  Bruce Hart   United States
Messages: 1500
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
Senior Member
William,
You stated that you got the Onan (new one) from Jim K. and it is behaving
the same but more frequently. Did you get a new Dino board with the new
Onan. Is there anybody close by you can swap boards with? What is common
with the old Onan and new Onan (remote switch inside coach)?

On Mon, Jul 24, 2017 at 11:51 PM, Guy Lopes wrote:

> Thanks Ken!
>
> Is your Son still selling the large format wiring diagrams?
>
> Guy Lopes
> 76 RB Birchaven
> Sacramento, CA
>
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Ken
> Henderson
> Sent: Sunday, July 23, 2017 7:53 AM
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] ONAN starting
>
> OK, I've removed the erroneous ground connection from Pin 8. The revised
> diagram is here:
>
> https://drive.google.com/file/d/0B3XquSIYjDleeFphNGM1OXZKd1k/
> view?usp=sharin
> g
>
> Eventually I'll get that version "KH Onan Wiring 170723" onto GMCMHPhotos
> to
> replace "KH Onan Wiring 170604", but I'm having trouble right now.
>
> Ken H.
>
>
> On Sat, Jul 22, 2017 at 11:51 PM, Ken Henderson
> wrote:
>
>> Bill,
>>
>> You're absolutely correct: My latest version is WRONG! I guess when
>> I looked at the OEM diagram and eliminated the Voltage Regulator, I
>> ignored that the SCR in the VR was isolating that point from ground.
>>
>> I'll revise and publish that tomorrow. Gosh, I hope that's the last one!
>> I think my four score years mean I should give up this sort of thing.
>> :-( Y'All keep looking for errors -- and consider assuming this task.
>>
>> Ken H.
>>
>>
>> On Sat, Jul 22, 2017 at 9:32 PM, Bill Wevers wrote:
>>
>>> Mr. Henderson,
>>> I believe your original schematic was correct, with respect to Pin 8.
>>> When I look at PIN 8 on my Onan board, it does not connect to GND.
>>> That's the 30V generator output being rectified by CR1 and filtered
>>> by R1 C1.
>>>
>>
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--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart 1976 Palm Beach 1977 28' Kingsley La Grange, Wyoming
Re: [GMCnet] ONAN starting [message #321041 is a reply to message #321036] Tue, 25 July 2017 06:09 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
Guy,

Yes, Alan still sells large diagrams. The list and his contact info are at
bdub.net.

Ken H.

On Tue, Jul 25, 2017 at 1:51 AM, Guy Lopes wrote:

> Thanks Ken!
>
> Is your Son still selling the large format wiring diagrams?
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: [GMCnet] ONAN starting about 2 K windings [message #321042 is a reply to message #321037] Tue, 25 July 2017 06:14 Go to previous messageGo to previous message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
If my WAG is correct, it should be obvious when K1 is disassembled. As I
said, neither Duane nor I could figure any reason for the jumper's
existence, so I don't think removing it would be a problem. In fact,
others have replaced that solenoid relay with an ordinary "Ford" relay with
no reported problem.

Ken H.

On Tue, Jul 25, 2017 at 2:15 AM, Ken Burton wrote:

> If the failing component is as Colonel Ken is suggesting, what About
> removing the internal jumper inside the solenoid? I do not see how that
> would
> hurt anything. I would not try it without Colonel Ken's blessing unless
> it can be easily reinstalled. I have no idea as I have never seen it.
> --
>
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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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