OMC Kill-switch question

[frankr]

Here’ my last guess:  Sloppy redraw shows what I think the problem is.  With Switch A closed, and points on left opens, the counter EMF and condenser discharge flows to the right side and to ground via right side points and coil primary winding (orange track).

Closing Switch B puts it in parallel with the above track.

Conclusion:  There is a surprising whallop going through that circuit.  +/_  several hundred volts, actually.  I think you have too much resistance in your kill circuit, and it is not dissipating all of the energy, leaving enough to create some sort of weak spark in the running cylinder.   Yeah, I know, you Ohmed it all out. Probably with low voltage and less than a MA.  Prime suspect: Switch A rating.  Switch B in parallel provides a higher total rating.  Second suspect: the wires size or broken strands.

OK, ball is back in your court.

 

[nj-boatbuilder57]

Resistance in the circuit could certainly leave any residual magnetism free to “play” (wreak havoc), perhaps allowing just enough sparking to make the engine continue.  And I agree: “zero ohms”, static, with the 9V battery in my Fluke meter could very well be giving me a reading that isn’t matched with the actual electrical dynamics of this circuit while in full operation.

I may do a deeper dig into this, but that said: the schematic I drew in the first post accomplishes (simultaneously) the functionality of both switches “A” & “B”, so I may just replace the switch in the dashboard accordingly and be done with it.  After all, the mission is a functional kill switch & nothing more..

[frankr]

Sorry for the sloppy post. I was in medical crisis when I prepared and posted it.  Still am, somewhat.  You gets what you gets and that is what I gots.

 

[crosbyman]

official layout

Joining AOMCI has priviledges 🙂

[nj-boatbuilder57]

^^^

Same as I inserted into my initial post.

[fleetwin]

Frank:

Hoping you are OK…  Don

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