If you X Ray or disect your 12 volt coil you likely will NOT find any discrete stand alone "resistor" hidden away somewhere inside the can, (still out of old habits or old wives tales many still refer to them as having a "resistor" inside) But no prob, people have a right to call them anything they darn well please despite whats really inside them!!!!!
Butttttttttt if you have a 12 volt tractor and your coil is labeled "12 volts" orrrrrrrrr "12 volts NOT for use with ballast" orrrrrrrrrrrr"12 volts no ballast required"
NO DO NOT ADD YET EVEN MORE EXTERNAL SERIES BALLAST OR THE SPARK WILL BE WEAK
On a 12 volt tractor if you have a 6 volt coil (or one labeled 12 volts requires ballast) then YES you need just what it says or the coil will overheat and the points will burn up much sooner
How to wire an external ballast you ask??? It wires in series between the ignition switch IGN output and the coils LV primary input.
ONCE MORE if its a 12 volt tractor you can use EITHER a "12 volt" coil or one labeled "12 volts NOT for use with ballast" buttttttttt if you use a 6 volt coil (or one labeled 12 volts requires ballast) then add the series ballast after the ign switch IGN output and before and ahead of the coils input so it drops 6 volts leaving 6 on the 6 volt coil as it was designed to handle WELL SHUCKY DERN
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