IFFFFF it has one and its wired right and good, if you turn the ignition on and put a voltmeter on the coils input (NOT to distributor) terminal and the points are closed and it and all else is good and correct,,,,,,you would get a reading in the 6 to 7 volt range VERSUS 12 volts if theres no external series ballast. IE the ballast is there and drawing current and dropping the 12 battery volts down to 6 for a 6 volt coil
ON a 12 volt tractor you can EITHER use a full true (some call internally ballasted) 12 volt coil OR ELSE a 6 volt coil plus the series voltage dropping (12 to 6) external ballast after the switch before and ahead of the coil.
One advantage of the 12 volt tractor and 6 volt coil if it has the start ballast by pass system, is you can by pass the ballast during cranking for a good starting spark.
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