Home » Public Forums » GMCnet » ONAN starting (starter stays engaged after starting)
| Re: ONAN starting about 2 K windings [message #320962 is a reply to message #320929] |
Mon, 24 July 2017 09:28   |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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Ken Burton wrote on Sun, 23 July 2017 22:17I 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 - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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