Sounds like the alternator's backfeeding the coil after the ignition switch is turned off and while the engine's still spinning.
A fix is simple: Insert a lamp, resistor or diode in the wire between the alternator #1 terminal and the switched side of the ignition switch.
Lamp should be a 12 volt instrument panel/side marker bulb (#1815, #168, #194, etc). Resistor can be any resistance between about 10 and 40 ohms and rated for at least 1 watt. Diode should be a 1N1004 or similar. Wire the diode so the banded end connects to the alternator #1 terminal.
My personal preference is for a light. It will work as an "idiot light" for the charging system, same as on a car.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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