If it was converted to 12 Volts, you can use EITHER an old 6 volt coil PLUS an external series voltage dropping (12 down to 6) Ballast Resistor. If its a full true a 12 volt coil, you dont use a ballast resistor or ballast by pass circuit when cranking..
If your test lamp on the coils output to distributor terminal is flashing ON (when points open) and fully OFF (when points closed) when cranking that tells me the points are operating opening and closing the coils current as they should.......
Remove the coil wire from the dist cap (leave coil end intact) and place its terminal within 1/8 inch or so from tractor iron turn her on and crank her over TO SEE IF THE COIL IS FIRING a spark to ground ?????????
If so, the coils working and there may be a problem in the dist cap or rotor ......... Ive seen many rotor tips short out to dist shaft and dist caps with a crack or carbon trace or full of moisture preventing spark at the plugs
If the coils NOT firing it could be bad
If the condensor is shorted out the coil wont fire
If the condensor is open or weak it can still fire but a weaker spark and the points will burn soon
Check easy things first like points and condensor and dist cap and rotor BEFORE the more expensive coil although sure if all else is okay that can be the problem
Check out my Troubleshooting Procedure when theres no spark, it can help find the problem
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