In Reply to: Engine will not stop running posted by Bruce on October 21, 2020 at 14:47:56:
Classic symptom of a Delco 10SI 3 wire alternator with no isolation in the line from ignition switch to #1 pin in the edge plug.
No isolation allows feedback from alternator back to ignition coil and the engine continues to run.
Common isolation options are to add a diode, indicator lamp, or resistor in the line.