The use of a "diode" or a "resistor" or an "incandescent idiot light" in the alternators small 1R excitation terminal is to prevent backfeeding an ignition coil so the engine doesn't still run when the ignition is turned off in cases where that initial excitation is provided by wiring the small 1R to an ignition coils input (what ignition switch feeds when on).
If you use an idiot light in that circuit (a diode or resistor can also work) make sure its a small incandescent NOT an LED. The initial excitation circuit I'm talking about is one fed by say an ignitions switches terminal which is hot ONLY when switch is on/run. If you wired it to a voltage source that's always hot, that could eventually discharge a battery when the tractor isn't running.
A simple volt meter can be wired to the battery NEG and POS via a switch that's hot when a switch is turned on.
If the alternators internal diodes have failed, even if all else is wired right and per the above, that could cause your problem.
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