Home » Public Forums » GMCnet » ONAN starting (starter stays engaged after starting)
| Re: [GMCnet] ONAN starting [message #320843 is a reply to message #320832] |
Sat, 22 July 2017 13:46   |
William Shourt
Messages: 35
Registered: August 2015
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Thanks Ken, there is only one wire running from K1 to pin 7 on the control board. It is connected to the left terminal as referenced in picture Mr Fisher sent.
Just started again and had .2VDC on K1 after engine started running, 12.6 before with starter still engaged. Pulled wire from starter solenoid and starter stops. Shut down and restarts starter stops on its own and beautiful Onan just purrs along.
Seems to disengage when warmer, seems to be happening more often.
Worn spot on coil in starter?
Sent from my iPad
> On Jul 22, 2017, at 8:54 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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