Home » Public Forums » GMCnet » ONAN starting (starter stays engaged after starting)
| Re: [GMCnet] ONAN starting [message #320852 is a reply to message #320832] |
Sat, 22 July 2017 18:00   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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Senior Member |
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Ken,
I'm sure glad you mentioned my Onan wiring diagram. As you may recall,
Gene Fisher pointed out a while back that I had an error in the area of the
"engine running" circuit. When I looked at it at first, it seemed to be
merely a matter of inaccurately labelled ground. Recently, I studied the
diagram more carefully and found that I made a LOT of errors in my
re-drawing. I think none of them seriously affected anything anyone's
likely to be interested in, but it was/is definitely WRONG. I've been
through and tried to correct all the errors I found. Here's the link to
the new version:
https://drive.google.com/file/d/0B3XquSIYjDleMEVlVUhKeDVpU0k/
view?usp=sharing
I hope someone will compare this version to Onan's original. Apparently no
one had done so during all the years my original has been circulating.
I'll try to replace the version on GMCMHPhotos with this new version. If
anyone finds the old one anywhere else, please replace it with this
corrected on, labelled "KH Onan Wiring 170604".
My apologies for publishing erroneous information.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc., etc.
www.gmcwipersetc.com
On Sat, Jul 22, 2017 at 11:54 AM, Ken Burton wrote:
> I am sitting here looking at the Onan Wiring diagram that Colonel Ken
> made. +12 volts should always be on one side of the coil. The Onan board
> controls the K1 coil by applying ground (-12vdc) on the opposite side of
> the coil. There is one wire from the K1 coil to pin 7 on the Onan board.
> There should be no other wiring connections to either the coil terminal or
> pin 7 on the Onan board.
>
> That said, Pin 7 on the Onan board goes only to the N/C point of K2 and no
> where else. So when K2 is powered by the 33VAC from the alternator, the
> K2 N/C point should open up and block any path to the ground side of K1.
> So at this point I would suggest that you have a wiring error, or a short on
> the board, or a tacked relay point on K2. Even if you had a tacked relay
> point, the voltage should drop to K1 when you remove your finger from both
> of the starting switches.
>
> I guess that there is a possibility that there could be a worn spot on the
> coil that when energized the armature might short to. I have never seen
> this but it is the only idea that I have right now on what could be
> causing this problem. That is just a wild guess because I have never seen
> of or
> heard of this failure.
> --
> 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
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