IFFFFFFF you wanan get rid of any ballast resistor on a 12 volt tractor YOU NEED A FULL TRUE (some call internally ballasted) 12 VOLT COIL
Whether or not a voltage dropping (12 to 6) external series ballast resistor is needed or not DEPENDS ON WHAT COIL YOU HAVE. If its a 12 volt tractor but a 6 volt coil, THE RESISTOR IS NEEDED otherwise the coil overheats.
A 12 volt tractor needs EITHER a full true 12 volt (some call internally ballasted) coil NO BALLAST REQUIRED or elseeeeeeeee if its a 6 volt coil then you need the external series voltage dropping (12 to 6) ballast resistor so the coil dont draw too much current n overheat
ALSO Id Pertronix recommends the ballast THEN YOU INDEED NEED IT cuz depending on the elec switches current rating it may still be required (Thats if you have an elec switch???)
The voltage on the coils low output (to distributor) terminal should read near full battery voltage when the points are open, but near ZERO volts when they are closed. Over on the coils input (from IGN switch) the voltage should be 12 volts on a straight 12 volt system with a 12 volt coil or 6 volts if a 6 volt coil and ballast is used WHEN THE POINTS ARE CLOSED.
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