Home » Public Forums » GMCnet » [GMCnet] Betty's Onan
| [GMCnet] Betty's Onan [message #223829] |
Sat, 28 September 2013 07:15  |
Robin Hood
Messages: 1078
Registered: April 2011
Karma: 3
|
Senior Member |
|
|
Ok, seperate thrad for this. What all did y'all find out about it at the
International Rally in Branson? Supposedly it runs, and doesn't make power.
Was the consensus a bad Voltage Rectifier (not regulator)? Why wasn't a new
one installed? The right tools were unavailable??? Really? At a GMC
rally????
Need more input. :)
Some time I want to head down there and work on her Onan and get it to make
power. It will make a convenient excuse for a trip to the coast for my
wife. :)
--
Robin Hood
Jackson, MS
2013 Subaru Outback "Top Flight"
1968 Pontiac Catalina "The Cheshire Cat"
1978 GMC Royale motorhome "Pinto Bean"
1977 GMC Palm Beach motorhome "Barn Queen"
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Betty's Onan [message #223834 is a reply to message #223829] |
Sat, 28 September 2013 08:26  |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Robin,
The consensus of Ken Broostin (worked for Onan), Ken Frey (has worked on GMC's for donkey's years), and Rob Mueller (the electrical
problems were beyond his skill level) was that due to the fact that the wiring had been butchered to attempt to repair it at the
convention was beyond what could be done at the convention.
You might find yourself taking up residence in Diamondhead. ;-)
I trust Betty and Bill have dropped off your camera and tripod, I never used it, turned out that the air bag cover tore on the seam
when it was inflated.
Regards,
Rob M.
-----Original Message-----
From: Robin Hood
Ok, seperate thrad for this. What all did y'all find out about it at the
International Rally in Branson? Supposedly it runs, and doesn't make power.
Was the consensus a bad Voltage Rectifier (not regulator)? Why wasn't a new
one installed? The right tools were unavailable??? Really? At a GMC
rally????
Need more input. :)
Some time I want to head down there and work on her Onan and get it to make
power. It will make a convenient excuse for a trip to the coast for my
wife. :)
--
Robin
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
| Re: [GMCnet] Betty's Onan [message #223835 is a reply to message #223829] |
Sat, 28 September 2013 08:32 |
 |
WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
|
Senior Member |
|
|
I gave your brake parts to Tom. Guess he handed them off to Betty.
Now, Betty has a new rectifier that I sold her. I walked over to her coach a couple of times to see how things were progressing. Several looked at the Onan and tried to get it purculating. Even had Ken Frey, among others take a look. The word I got was it had been rigged and wires were messed up pretty bad. They could not get the rectifier in for some reason, but other things have to be repaired as well. Ken Burton checked the old rectifier and it was bad, one diode shorted, or open, can't recall. It was not for a lack of effort that it did not get repaired, but others who tried to fix it, will need to say just what the problem is.
Now you know all that I was told.
Dan
3 In Stainless Exhaust Headers
One Ton All Discs/Reaction Arm
355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
Holley EFI/10 Tire Air Monitoring System
Solarized Coach/Upgraded Windows
Satelite TV/On Demand Hot Water/3Way Refer
|
|
|
|
|
|
|
|
| Re: [GMCnet] Betty's Onan [message #223839 is a reply to message #223837] |
Sat, 28 September 2013 08:47 |
Robin Hood
Messages: 1078
Registered: April 2011
Karma: 3
|
Senior Member |
|
|
Well, if any of the wires on the control board wiring harness are burned,
we should probably just start with a new one.
http://www.appliedgmc.com/prod.itml/icOid/629
The control board MIGHT be bad, but that shouldn't affect the power
situation, and the Onan actually runs. I will invite myself down there some
time, and be sure to bring my camera and laptop so I can consult with the
Hive Mind here.
I've been mostly through my own Onan, other than the rectifier and field
windings.
That 800 dollars was a "go away, we don't want to mess with this" quote. A
new control board is under 200 bucks and takes very little time to install.
A new wiring harness is under a hundred.
This is WWII technology. Heavy, over-engineered, lots of tolerance and
slop. With a bit more time and effort I think I can zero in on the problem
and get her going.
--
Robin Hood
Jackson, MS
2013 Subaru Outback "Top Flight"
1968 Pontiac Catalina "The Cheshire Cat"
1978 GMC Royale motorhome "Pinto Bean"
1977 GMC Palm Beach motorhome "Barn Queen"
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Betty's Onan [message #223848 is a reply to message #223839] |
Sat, 28 September 2013 10:17 |
Robin Hood
Messages: 1078
Registered: April 2011
Karma: 3
|
Senior Member |
|
|
Ah, crap. I think that the wiring harness that JimK sells is the one that
goes from the Control Board (called the Control Board Wiring Harness i
think, There is a whole nother PIECE of wiring harness, labeled "19A", Onan
Part Number 338-0753 that plugs into the Control Board Wiring Harness, and
attaches to the various doodads all over the engine. See Page32 of the Onan
manual http://www.bdub.net/manuals/onanmanual.pdf
I don't see that part of the Onan wiring harness on JimK's website. If
THOSE are the wires that have been chewed, burned, or otherwise butchered,
it means finding or remaking it.
On Sat, Sep 28, 2013 at 8:47 AM, Robin Hood <loxley@gmail.com> wrote:
> Well, if any of the wires on the control board wiring harness are burned,
> we should probably just start with a new one.
>
> http://www.appliedgmc.com/prod.itml/icOid/629
>
> The control board MIGHT be bad, but that shouldn't affect the power
> situation, and the Onan actually runs. I will invite myself down there some
> time, and be sure to bring my camera and laptop so I can consult with the
> Hive Mind here.
>
> I've been mostly through my own Onan, other than the rectifier and field
> windings.
>
> That 800 dollars was a "go away, we don't want to mess with this" quote. A
> new control board is under 200 bucks and takes very little time to install.
> A new wiring harness is under a hundred.
>
> This is WWII technology. Heavy, over-engineered, lots of tolerance and
> slop. With a bit more time and effort I think I can zero in on the problem
> and get her going.
>
> --
> Robin Hood
> Jackson, MS
> 2013 Subaru Outback "Top Flight"
> 1968 Pontiac Catalina "The Cheshire Cat"
> 1978 GMC Royale motorhome "Pinto Bean"
> 1977 GMC Palm Beach motorhome "Barn Queen"
>
--
Robin Hood
Jackson, MS
2013 Subaru Outback "Top Flight"
1968 Pontiac Catalina "The Cheshire Cat"
1978 GMC Royale motorhome "Pinto Bean"
1977 GMC Palm Beach motorhome "Barn Queen"
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Betty's Onan [message #223850 is a reply to message #223848] |
Sat, 28 September 2013 10:42 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
|
Senior Member |
|
|
| Robin Hood wrote on Sat, 28 September 2013 10:17 |
Ah, crap. I think that the wiring harness that JimK sells is the one that goes from the Control Board (called the Control Board Wiring Harness i think, There is a whole nother PIECE of wiring harness, labeled "19A", Onan Part Number 338-0753 that plugs into the Control Board Wiring Harness, and attaches to the various doodads all over the engine. See Page32 of the Onan
manual http://www.bdub.net/manuals/onanmanual.pdf
I don't see that part of the Onan wiring harness on JimK's website. If THOSE are the wires that have been chewed, burned, or otherwise butchered, it means finding or remaking it.
|
If the engine runs, and the bridge rectifier tested bad, then you need to plan on getting the new bridge rectifier installed, and that means figuring out why it was so hard to install. Since Tom Phipps was the one trying to install it, you should give him a call and ask what was up with that.
Once you get the bridge rectifier installed, if it still doesn't produce power, post here.
|
|
|
|
| Re: [GMCnet] Betty's Onan [message #223881 is a reply to message #223848] |
Sat, 28 September 2013 13:57 |
Emery Stora
Messages: 959
Registered: January 2011
Karma: 4
|
Senior Member |
|
|
I think it is the first you mention , the control board harness. Not sure you'll have to have a new one though. Just some patching up and reconnecting to the right terminals might do it.
The wires across the top of the engine have been spliced already. She said something about mouse damage.
I can't tell you the condition of the control panel. But the start switch appeared to be pushed in and inoperable.
I gave them a copy of the wiring diagram.
Emery Stora
On Sep 28, 2013, at 10:17 AM, Robin Hood <loxley@gmail.com> wrote:
> Ah, crap. I think that the wiring harness that JimK sells is the one that
> goes from the Control Board (called the Control Board Wiring Harness i
> think, There is a whole nother PIECE of wiring harness, labeled "19A", Onan
> Part Number 338-0753 that plugs into the Control Board Wiring Harness, and
> attaches to the various doodads all over the engine. See Page32 of the Onan
> manual http://www.bdub.net/manuals/onanmanual.pdf
>
> I don't see that part of the Onan wiring harness on JimK's website. If
> THOSE are the wires that have been chewed, burned, or otherwise butchered,
> it means finding or remaking it.
>
>
> On Sat, Sep 28, 2013 at 8:47 AM, Robin Hood <loxley@gmail.com> wrote:
>
>> Well, if any of the wires on the control board wiring harness are burned,
>> we should probably just start with a new one.
>>
>> http://www.appliedgmc.com/prod.itml/icOid/629
>>
>> The control board MIGHT be bad, but that shouldn't affect the power
>> situation, and the Onan actually runs. I will invite myself down there some
>> time, and be sure to bring my camera and laptop so I can consult with the
>> Hive Mind here.
>>
>> I've been mostly through my own Onan, other than the rectifier and field
>> windings.
>>
>> That 800 dollars was a "go away, we don't want to mess with this" quote. A
>> new control board is under 200 bucks and takes very little time to install.
>> A new wiring harness is under a hundred.
>>
>> This is WWII technology. Heavy, over-engineered, lots of tolerance and
>> slop. With a bit more time and effort I think I can zero in on the problem
>> and get her going.
>>
>> --
>> Robin Hood
>> Jackson, MS
>> 2013 Subaru Outback "Top Flight"
>> 1968 Pontiac Catalina "The Cheshire Cat"
>> 1978 GMC Royale motorhome "Pinto Bean"
>> 1977 GMC Palm Beach motorhome "Barn Queen"
>>
>
>
>
> --
> Robin Hood
> Jackson, MS
> 2013 Subaru Outback "Top Flight"
> 1968 Pontiac Catalina "The Cheshire Cat"
> 1978 GMC Royale motorhome "Pinto Bean"
> 1977 GMC Palm Beach motorhome "Barn Queen"
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Betty's Onan [message #223894 is a reply to message #223837] |
Sat, 28 September 2013 18:20 |
Betty Chimento
Messages: 20
Registered: August 2013
Karma: 0
|
Junior Member |
|
|
We really appreciate the support that we received at the convention. We know that you don't go there to work. We appreciate Tom Phipps getting down & dirty trying to install the rectifier without the proper tools ( he did not bring his coach). Also, not the ideal situation for working on the generator.
Emory, being the president, had a lot on his plate. We appreciate the time he was able to give to us & his concern.
Betty & Bill Chimento
Diamondhead, MS
78 Eleganza
Sent from my iPad
On Sep 28, 2013, at 8:35 AM, Emery Stora <emerystora@mac.com> wrote:
> I looked at it. There were several wires hanging down from the control panel and one wire had two inches of insulation burnt off. Someone had jumpered a wire to the solenoid on the starter. They could start the engine from the inside if the 12 volt breaker was turned on. This had a Clasco circuit breaker board rather than fuses and there was one for the Onan. When this circuit breaker was on the fuel pump ran all the time whether the Onan was running or not so something was very wrong with the wiring. It could not be started from the control panel.
>
> When started from inside, it was not getting voltage to either side of the breaker on the top of the Onan.
> I pulled the bridge rectifier and it had one leg that tested bad.
> They bought one from Jim Kanomata and Tom Phipps crawled under and bent the tabs of the rectifier and tried to install it. He spent about 1-1/2 hours and could not get it plugged in. He then had to leave as he was going home early.
>
> I couldn't spend any more time on it as I had to prepare the agenda for the next board meeting and for the Member's Meeting.
> Then Ken Frey and a couple of others went over and took a look at it. They decided that it was just too much to try to repair at the rally.
>
> Apparently they had a dealer look at it and had been quoted $800 for a control panel. I suspect the $800 was mostly labor to try to redo all the wiring, etc.
> You would have quite a bit of rewiring to do and for all we know it might need another control panel or at least a rebuilding.
>
> Hope you can help them out but plan on quite a few hours to get it done.
>
> Emery Stora
>
> On Sep 28, 2013, at 7:15 AM, Robin Hood wrote:
>
>> Ok, seperate thrad for this. What all did y'all find out about it at the
>> International Rally in Branson? Supposedly it runs, and doesn't make power.
>>
>> Was the consensus a bad Voltage Rectifier (not regulator)? Why wasn't a new
>> one installed? The right tools were unavailable??? Really? At a GMC
>> rally????
>>
>> Need more input. :)
>>
>> Some time I want to head down there and work on her Onan and get it to make
>> power. It will make a convenient excuse for a trip to the coast for my
>> wife. :)
>>
>> --
>> Robin Hood
>> Jackson, MS
>> 2013 Subaru Outback "Top Flight"
>> 1968 Pontiac Catalina "The Cheshire Cat"
>> 1978 GMC Royale motorhome "Pinto Bean"
>> 1977 GMC Palm Beach motorhome "Barn Queen"
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Betty's Onan [message #223898 is a reply to message #223881] |
Sat, 28 September 2013 18:40 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
|
Senior Member |
|
|
Whomever worked on Betty's Onan butchered the wiring, as a very short answer. There was two bald spots on one wire that I patched with eletrical tape, but that did not make me happy.
The new version of the bridge rectifier would not sit inside the Onan OEM nylon holder for the rectifier. New rectifier would not seat correctly. The edges of the nylon holder need to be removed to allow the rectifier to seat fully. There are other ways to attack this problem, but I think this would be easiest.
We did not ohm out the field windings. Frankly, I was tired after the amount of time under the coach trying to fit the rectifier, to remain under the coach on the ground, knowing that without replacing the rectifier, all our efforts were for naught.
Her Onan also needs new motor mounts, the Assembley has dropped down and the starter is hitting the GMC frame. Easy enough to do, but need to order the mounts. M&D Mower, on the net, has these parts in stock. Not replacing the mount will eventually break the starter mount, if it has not already done so. I did not test the starter mount for fracture. JmK has new starter brackets.
The remote start circuit needs to be returned to original Onan design. Thus is another spot the P.O. butchered. As now wired, the only way to turn off the Onan is to throw the circuit breaker to the off position. If this switch is on, the Onan has constant power and the fuel pump continues to run.
I would also suggest a new control board, although the motor does operate.
The problem is it does not produce electricity, as it now sits.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
|
|
|
|
Goto Forum:
Current Time: Tue Nov 12 09:11:37 CST 2024
Total time taken to generate the page: 0.03901 seconds
|
GMCforum
Search
Help
Register
Login
Home
