OK, I get it. As long as the radiator temp switches are are calling for fan, very typical situation at engine shut off, as the fans spool down they provide enough juice to keep the ignition energized.
v8capri- I'd try the diode trick first. I've never experienced any run on after shut down
I can't tell you the rating of the stud diodes but I'd guess around 30-40 amp, but besides them all you'll need is two ring terminals and some tape
You'll have to remove the air deflector panel for access (two screws}
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