Seems if someone doesn't want components to forget (like switches) - there is nothing simpler than installing a self-exciting regulator in the alternator and using the one-wire hookup.
I don't particularly like the one-wire setup - but it does make things easy. To be technical, most of the 10SIs and 12SI will self-excite but they have to be really revving to do so (over 3000 RPM). Not practical, especially on a tractor.
If you use a conventional externally excited 10Si or 12SI and an automotive type ignition switch, you don't need a resistor or a diode to prevent run-on with the key off. Just run the excite wire to the ACC terminal, and the igntion feed (or injection pump feed) to the IGN terminal. When the key is in "off" position, ACC and IGN are isolated from each other and run-on won't happen.
That being said, it's pretty easy just to add a diode or resistor that cost less then a buck.
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