Put a test lamp on the distributors lil side input terminal or else the coil terminal that wires to the distributor, turn the ignition on and crank the engine over (could remove high voltage coil lead so it dont start) and the lamp should flash ON when points are open but then dead OFF when they are closed. If the light fails to go off the points arent closing fully,,,,,,,, or the distributor dont have a good ground. If it fails to light up the points arent opening,,,,,,,or theres a short like maybe the distributors lil side stud is shorted to case (broken plastic insulator etc),,,,,,,,or the coils primary winding is bad/open..
On a 6 volt coil the primary between the 2 lil terminals ought to read around 1.25 to 2 ohms.
Id make sure the side input stud isnt shorted,,,,,,the dist has a good ground,,,,,,,the points open n close as they should,,,,,,,,the condensor isnt shorted out. If you remove the condensor n she always fires (even tho a weak spark) try yet another condensor.
Its possible when a partly bad coil or condensor warms up they can fail but it takes more then a few minutes before that normally happens. If theres no shorts n the ground is good and its NOT a condensor problem it could be a bad coil.
To be sure its NOT a cap or rotor problem remove the coil wire where it connects to dist cap (leave coil end intact) and place that wire 1/8 away from tractor iron n crnak ehr over n see if she keeps firing????? If so there but NOT with the wire replaced and youre looking for sparks at plug wires n they stop, suspect a cap or rotor problem.....
If you need my entire Troubleshooting Procedure for non sparking post back
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