Connecting the excite wire to the starter will not work well. The thing is that excite power to the alternator needs to be applied until the alternator is up to speed and charging. Their is that gap between when the engine starts, where you relkease the starter, and the time untill the alternator is up to speed and charging. Add to that,the Alternator excite terminal must not be connected to ground while charging. Having the excite wire connected to the starter windings would be a very good ground and would destroy the diode trio or regulator in the alternator very quickly.
Your best way to excite the alternator on a magneto equipped tractor is to use a normally open two terminal oil pressure switch in an engine oil gallery. Connect a 10 amp fuse to battery power and run it through the oil pressure switch to the alt excite terminal. When the engine runs and has oil pressure, the switch closes and excites the alternator. When the engine stops, it disconnects power to the alternator excite circuit. The 1980 chevrolet 6 cyl pickup engines used such a switch to power the electric choke .
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