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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Today's Featured Article - Stories From Old Farmer - by K. Pratt. Old Farmer, a.k.a. Dale Jensen began posting messages to our discussion forums at the grand age of 75. With extensive knowledge of farming and tractors, he valued the past and the ways that went with it. He shared these values with us until shortly before his passing. I spoke with Dale in his last days and requested his permission to share some of his stories with the readers of our magazine. He agreed, and provided the
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