Mark, You are absolutely right, coils need enough current to make a strong magnetic field. However too much current will fry points and the coil.
If you recall a ballast resistor was used to limit current to the minimum current needed to make a spark at operation voltage, alternator voltage. A minimum of 13.6v and a max of 14+. not 12v.
The ballast was bypassed during cranking on my old cars that used points and condenser.
So the current, which is determined by the voltage applied to the coil, in the primary is not enough to start a tractor if the ballast is not bypassed when cranking.
Some people converting to 12v don't bypass the ballast. My jubilee has no place on the starter solenoid to bypass the ballast. I use a diode to bypass the ballast.
Some people give up on points and convert them to electronic ignition. I feel it is all related to the wrong ballast, the wrong primary current.
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