If you don't run the one wire alternator "hot" wire through the switch, then you'll need a diode to keep the alt from draining the battery. Some alts come with the diode installed, some don't. I'm going through this myself right now. Those diodes are readily available and under $10.00. They can be soldered and heat shrinked right into the hot wire. Another option is to use a standard 3 wire alt or use a battery disconnect switch on the ground.
I've never run a circuit breaker in an alt line on a tractor. Not enough sensitive electronics to warrant it IMO. A fuse, maybe, but it's got to be a good sized fuse.
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