If the tractor has a 6 volt battery you should use a 6 volt coil to get enough spark.
A ballast resistor is used on a 12 volt system with a 6 volt coil, the resistor drops the coil voltage to 6 volts so it won't overheat.
A ballast resistor with a starting bypass can also be used on a 12 volt system with a 6 volt coil. In normal operation the resistor drops the coil voltage to 6 volts. During starting only the bypass delivers 12 volts to the 6 volt coil for an extra strong spark.
Others, please correct me if I got this wrong, Thanks.
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