Similar to the other gents, I use a 10 ohm safety current limiting voltage dropping resistor in the alternators external excitation circuit so the engine doesnt continue to run (via alternator backfeeding the coil) when the IGN switch is turned off. (talking about the GM 10SI 3 wire family of alternators that use external initial excitation voltage to start charging) A didoe serves the same purpose (has a 0.6 voltage drop) but doesnt provide the small degree of current limiting like a resistor does, which is why I use a resistor instead of a diode.
For another double duty method, you can instead use a small "incandescent" NOT LED indicator light which provides current limiting to prevent run on plus serves as an idiot light.
I think it was Bob M who noted you might even place a resistor in paralell with the idiot light so the alternator still excites even if the light were to burn out...
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