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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