Home » Public Forums » GMCnet » Basic Onan Questions...
| Basic Onan Questions... [message #293361] |
Sun, 03 January 2016 13:09  |
quadracerx1
Messages: 207
Registered: April 2013
Location: Puyallup, Washington
Karma: 1
|
Senior Member |
|
|
I don't have my coach here at the moment so I cant look at it...
I purchased a new Control Board with the pick tail connector. Question is I also noticed you can purchase the control board without the connector pick tail...?
Do some Onan's come without the pick Tail connector from the factory? Or, are they all wired with the plug pick tail and plug...?
Thanks,
Steve
75 26' GMC Glenbrook
Puyallup, Washington
|
|
|
|
|
|
| Re: Basic Onan Questions... [message #293368 is a reply to message #293361] |
Sun, 03 January 2016 14:39  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
A Molex<tm> 12 pin inline connector - male and female - and a dozen 'flag' (right angle) push on connectors and some wire and you can make the inline connector. All the Onans I've seen in RV service had the inline connector. A couple of the older ones we use ddin't have - the wires went directly to whatever they were connected to (fuel pump, coli, etc).
The common failure modes are, the blade connector on the PC board cracks its solder connection and becomes intermittent; the wire flexes and breaks at the connector at either end; the Molex crimps or the blade connector crimps loosen and become intermittent. making up a new pigtail isn't hard.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
|
|
|
|
|
| Re: [GMCnet] Basic Onan Questions... [message #293372 is a reply to message #293368] |
Sun, 03 January 2016 15:35 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
|
Senior Member |
|
|
Beats me why more folks don't do what I did many years ago when I still had
an Onan: Completely rewire it. This and a couple of following photos
don't show it very well, but it was a BIG improvement:
http://www.gmcmhphotos.com/photos/4kw-onan-air-filter-26amp-3b-new-wiring/p4063.html
The fundamental wiring of the Onan is trivially simple and requires only
about 1/3 of the total length of the OEM harness. I installed a terminal
strip for the 4 wires to the remote control, then replaced each of the
flag-terminaled wires on the control board with a color coded wire directly
to its functional destination. With new flag terminals (you MUST use 3/16"
FLAG terminals to clear the board cover), board connection problems
disappeared. Eliminating the 12-pin Molex production convenience connector
eliminated most others. New ring terminals where required did away with
the rest of them. The color coding made circuit functions immediately
obvious -- there are only a few.
It's not a recommendation, but the wire colors labeled on this schematic
are the ones I chose:
http://www.gmcmhphotos.com/photos/onan/p39734-kh-redrawn-onan-schematic.html
Worked for me, from 2001 to 2007, when I began the search for a better
alternative to the Onan.
Ken H.
On Sun, Jan 3, 2016 at 3:39 PM, Johnny Bridges wrote:
> A Molex 12 pin inline connector - male and female - and a dozen 'flag'
> (right angle) push on connectors and some wire and you can make the inline
> connector. All the Onans I've seen in RV service had the inline
> connector. A couple of the older ones we use ddin't have - the wires went
> directly
> to whatever they were connected to (fuel pump, coli, etc).
> The common failure modes are, the blade connector on the PC board cracks
> its solder connection and becomes intermittent; the wire flexes and breaks
> at
> the connector at either end; the Molex crimps or the blade connector
> crimps loosen and become intermittent. making up a new pigtail isn't hard.
>
>
>
> --johnny
>
> --
> '76 23' transmode Norris upfit
> Braselton, Ga.
>
> "Sometimes I wonder what tomorrow's gonna bring when I think about my
> dirty life and times" --Warren Zevon
>
> _______________________________________________
> 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
|
|
|
|
| Re: [GMCnet] Basic Onan Questions... [message #293373 is a reply to message #293366] |
Sun, 03 January 2016 15:53 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
|
Senior Member |
|
|
Beats the heck out of me why more people don't do what I did many years
ago: Completely rewire the Onan. This and the following photos don't show
it well, but the simplification is dramatic -- only about 1/3 as much wire
is needed as in the OEM harness:
http://www.gmcmhphotos.com/photos/4kw-onan-air-filter-26amp-3b-new-wiring/p4063.html
I added a 4-terminal screw block for the remote control wiring, then
replaced each of the wires on the control board with color coded
replacements directly to their functional destinations. By using new flag
terminals (you MUST use 3/16" FLAG terminals to clear the board cover)
board connection problems were eliminated. New ring terminals at the
destination components eliminated problems there. MOST of the problems
were eliminated by not including the 12 pin Molex "production convenience"
connector.
With unique wire colors for the various functions, one could tell at at
glance what each wire was for, greatly simplifying troubleshooting. While
it's not a recommendation, the colors on this schematic are the ones I
chose (ignore the fact that I had a 4kW; the 6kW is identical):
http://www.gmcmhphotos.com/photos/onan/p39734-kh-redrawn-onan-schematic.html
It worked for me from 2001 to 2007, when I began the search for a viable
alternative to the Onan.
Ken H.
_______________________________________________
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
|
|
|
|
| Re: Basic Onan Questions... [message #293374 is a reply to message #293361] |
Sun, 03 January 2016 16:10 |
 |
RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
|
Senior Member |
|
|
Ken,
Thanks for that "Re-wiring" diagram. I always thought it had a fair bit of extra wiring but never sat down to figure it all out.
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
[Updated on: Sun, 03 January 2016 16:10] Report message to a moderator |
|
|
|
| Re: [GMCnet] Basic Onan Questions... [message #293384 is a reply to message #293374] |
Sun, 03 January 2016 23:13 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
|
Senior Member |
|
|
The one disadvantage we see with the Dinosaur board we sell with the
harness, is that it is hard to jump 9-5, 9-11
9-5 runs the pump, 9-11 the ignition and fuel pump.
On Sun, Jan 3, 2016 at 2:10 PM, Bruce Hislop wrote:
> Ken,
> Thanks for that "Re-wiring" diagram. I always thought it had a far bit of
> extra wiring but never sat down to figure it all out.
>
> --
> Bruce Hislop
> ON Canada
> 77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
> Hubler 1 ton front end
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
> My Staff says I never listen to them, or something like that
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
|
|
|
|
| Re: [GMCnet] Basic Onan Questions... [message #293478 is a reply to message #293370] |
Wed, 06 January 2016 16:39 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
USAussie wrote on Sun, 03 January 2016 14:09G'day,
As they say "a picture is worth a thousand words" so here's two thousand:
http://www.appliedgmc.com/products/full/628.gif
The board on the right is what an OEM board looks like with the push on pins to which the OEM Molex connector leads plug into.
The board on the left has Molex connector and leads soldered to the board.
Regards,
Rob M.
The Pedantic Mechanic
You can buy replacement boards either way. I would definitely suggest the version with the pigtail permanently soldered on--eliminates those troublesome push on connectors that always corrode.
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
|
|
| Re: [GMCnet] Basic Onan Questions... [message #293483 is a reply to message #293480] |
Wed, 06 January 2016 18:37 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
|
Senior Member |
|
|
I'm sure other GMC shops can supply them, but we have plenty of each kind
in stock and warranty them for 3years.
On Wed, Jan 6, 2016 at 3:07 PM, D C _Mac_ Macdonald
wrote:
> What/who is the source for the replacement boards?
>
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> ~~ ~ D C "Mac" Macdonald ~ ~~
> ~ ~ Amateur Radio - K2GKK ~ ~
> ~ ~ Since 30 November '53 ~ ~
> ~ ~ USAF and FAA, Retired ~ ~
> ~ Member GMCMI and Classics ~
> ~ ~ ~ Oklahoma City, OK ~ ~ ~
> ~~ ~ ~ "The Money Pit" ~ ~ ~~
> ~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
> ~ ~ ~ '76 ex-Palm Beach ~ ~ ~
> ~~ k2gkk + hotmail dot com ~~
> ~ www.gmcmhphotos.com/okclb ~
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
>
>
>
>> Date: Wed, 6 Jan 2016 15:39:10 -0700
>> To: gmclist@list.gmcnet.org
>> From: NEXT2POOL@gmail.COM
>> Subject: Re: [GMCnet] Basic Onan Questions...
>>
>> USAussie wrote on Sun, 03 January 2016 14:09
>>> G'day,
>>>
>>> As they say "a picture is worth a thousand words" so here's two
> thousand:
>>>
>>> http://www.appliedgmc.com/products/full/628.gif
>>>
>>> The board on the right is what an OEM board looks like with the push
> on pins to which the OEM Molex connector leads plug into.
>>>
>>> The board on the left has Molex connector and leads soldered to the
> board.
>>>
>>> Regards,
>>> Rob M.
>>> The Pedantic Mechanic
>>>
>>>
>>> You can buy replacement boards either way. I would definitely suggest
> the version with the pigtail permanently soldered on--eliminates those
>>> troublesome push on connectors that always corrode.
>>
>> --
>> Bob de Kruyff
>> 78 Eleganza
>> Chandler, AZ
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
| Re: [GMCnet] Basic Onan Questions... [message #293486 is a reply to message #293480] |
Wed, 06 January 2016 19:43 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
""What/who is the source for the replacement boards?
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ Since 30 November '53 ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ Member GMCMI and Classics ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~~ k2gkk + hotmail dot com ~~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ""
Flight Systems
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
|
|
| Re: [GMCnet] Basic Onan Questions... [message #293514 is a reply to message #293486] |
Thu, 07 January 2016 11:34 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
|
Senior Member |
|
|
We supply the boards, both ways with 3 year warranty.
On Wed, Jan 6, 2016 at 5:43 PM, Bob de Kruyff wrote:
> ""What/who is the source for the replacement boards?
>
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> ~~ ~ D C "Mac" Macdonald ~ ~~
> ~ ~ Amateur Radio - K2GKK ~ ~
> ~ ~ Since 30 November '53 ~ ~
> ~ ~ USAF and FAA, Retired ~ ~
> ~ Member GMCMI and Classics ~
> ~ ~ ~ Oklahoma City, OK ~ ~ ~
> ~~ ~ ~ "The Money Pit" ~ ~ ~~
> ~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
> ~ ~ ~ '76 ex-Palm Beach ~ ~ ~
> ~~ k2gkk + hotmail dot com ~~
> ~ www.gmcmhphotos.com/okclb ~
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ""
>
> Flight Systems
> --
> Bob de Kruyff
> 78 Eleganza
> Chandler, AZ
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
Goto Forum:
Current Time: Mon Sep 30 08:26:04 CDT 2024
Total time taken to generate the page: 0.05568 seconds
|
GMCforum
Search
Help
Register
Login
Home
