I hope you have an analog (needle pointer) voltmeter and/or a test light......it will be much easier than trying to do this with a digital meter.
Find the resistor/terminal block (see picture) and connect test light or analog meter to the upper left terminal (you are facing terminal block/looking toward rear of tractor)...other lead to chassis ground. Turn on key and bump starter while watching meter or light. As points open voltage should go up to battery voltage/light bright AND as points close voltage should go to about one-half of battery voltage/light dim or dark. Tell me what you find & we will go from there. Don't leave the key ON when done with measurements!!!
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