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Re: [GMCnet] I give up. (Onan) [message #190343 is a reply to message #190330] Wed, 14 November 2012 20:06 Go to previous messageGo to previous message
Robin Hood is currently offline  Robin Hood   United States
Messages: 1078
Registered: April 2011
Karma:
Senior Member
On Wed, Nov 14, 2012 at 6:43 PM, Ken Burton <n9cv@comcast.net> wrote:
>
>
> Robin Hood wrote on Wed, 14 November 2012 15:35
>> Oh, no, it's definitely destined for my Royale. :) That's the first
>> step in getting to work on the renovation of the Royale: there MUST be
>> air conditioning here in the humid, soupy South.
>
> Ok Robin,
>
> Here is my thought on that VR. Unplug it for now and tape up the wires. Make sure the the two that came off on the same terminal are still connected together before taping them up.

See, here is where I keep running into trouble. What are y'all talking
about with all this "same terminal" business? I see THREE terminals
with THREE wires. Until I get this sorted out, I can't exactly start
tying wires together willynilly, or something might get fried.

See the first bit of my latest video: http://youtu.be/2cSLSaUFidM

Summary: I show my voltage rectifier (I keep calling it a voltage
regulator) and explain why I"m so confused. I put the wire from the
alternator back on pin 8, which is how the generator came to me.
Generator still would not start unless jumpered but once started, it
would continue to run even if the jumper was removed, and had to be
stopped with the STOP button.

Hypothesis: Once running, the alternator gives enough juice that the
run circuit engages and stays that way. I suppose it's possible my VR
is defective and dragging down the AC too much to allow a start, but
not a problem once it's running. Also, I'm not confident in my meter
skills, so testing the wiring for the Low Oil Pressure sensor was a
problem. I did notice that if I disconnected Wire 12 from Pin 12 and
pushed the Start button that it would turn over maybe three
revolutions and quit: with that connection in place, holding down on
the Start button causes the starter to keep turning for as long as I
hold down the button. Which leads me to hypothesis number two: my Low
Oil Pressure circuit works.

The Control Board only has so many inputs. Alternator power is one,
and I beleive it's good or close to it. Oil pressure is another. All
other things equal, my gut is telling me that the VR may be keeping it
from cranking the way it's supposed to.

I need to learn how to use my meter better. I don't get voltages or
resistance values that I think I should be getting. Where the heck is
a good ground? The exhaust manifold? Negative battery terminal?

Tonight's wrenching session was cut very short: wife isn't feeling
well, and I'm being dutiful husband instead of messing about in the
garage.


>
> Later after you get it running you can remove the tape from the leads and reinstall them to reactivate the the battery charging and power supply function.
>
> Why would you want the VR / charger it to work?

I don't. This Onan is destined for the Royale. I *would* like to learn
as much as I can, though, since I'm going to have to keep at least two
of these things running.




--
Robin Hood
Jackson, MS
2003 Buick Lesabre
1968 Pontiac Catalina
1978 GMC Royale motorhome
1977 GMC Palm Beach motorhome
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