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| Re: [GMCnet] ONAN starting about 2 K windings [message #320994 is a reply to message #320962] |
Mon, 24 July 2017 13:26   |
William Shourt
Messages: 35
Registered: August 2015
Karma:
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Matt and Ken I have read this several times and i am not able to get my head around what you are saying, I plead old age.
I just tried it again but this time I read the voltage at the start solenoid where the wire from K1 hooks on. When the starter is cranking 12.5 volts, engine starts, starter keeps running and meter shows 8.3 volts. When I disconnect wire at K1 voltage drops to 0 and starter disengages.
Do you think that the 8.3 volts is leaking from the board-K1 side or the starter side or ???
> On Jul 24, 2017, at 7:28 AM, Matt Colie wrote:
>
> Ken Burton wrote on Sun, 23 July 2017 22:17
>> I have been looking at Ken H's wiring diagram. Someone is going to have to explain to me how the starter solenoid / relay works as shown. I see
>> 2 coils labeled only as K It seems to me that the lower (right) coil would be energized by K1 and in turn would close the K contact to power the
>> starter.
>>
>> What confuses me is the other K coil (wired vertically in the diagram). It appears to me when voltage to the K solenoid from k1 is dropped, then
>> the to two solenoid K coils are now in series with +12 and power is being applied by the closed K N/O contact. If this is true, we would have some
>> voltage other than +12 or 0 at the K1 N/0 contact that he is reading.
>>
>> What am I missing here?
>>
>> Do we have a diode missing in the diagram?
>>
>> Is the diagram wrong?
>>
>> Ken B.
>
>
> Kens et al....
>
> The diagram is accurate. But I just read my explanation twice and I don't understand it so we are going to add something.
> Print the picture:
> Mark the contacts inside the solenoid Ks.
> Mark the K winding in the vertical Kh.
> Mark the K winding in the Horizontal Kl.
>
> This is the way starter solenoids are built. The vertical Kh is a very high current winding that is essentially in series with the starter motor
> until the contact Ks closes. Then it is by-passed. That leaves the horizontal Kl winding to hold the contacts while the starter is cranking. If you
> disconnect the starter from the solenoid, the horizontal Kl winding may not have enough power along to pull the Ks contacts and make the machine
> crank. So, the Kh winging gets full battery until Ks closes. Then it is by-passed.
>
> I hope I explained that well enough.
>
> If the Kh winding goes bad, the solenoid will often not make at all, but it will draw current.
> If the Kl winding goes bad, the solenoid will chatter (and battery voltage looks good?).
>
> Care to guess how I learned all about this???
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
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