Im in a hurry, hard to tell from pic if its all correct or not. If its a 12 volt Neg ground tractor using a 6 volt coil and external ballast, power comes from ign switch,,,,,,,to and through ballast to + side of coil,,,,,,,,out - side of coil to distributor. With ign on and points closed not running Id expect 12 volts out of switch,,,,,,,,12 to high input side of ballast,,,,,,,,,around 5 to 7 on output of ballast and coils + input,,,,,,,,near zero on coils output to distributor since the points are closed. The ballast needs to be the correct ohms so it doesnt drop too much voltage (around 5 or 6 volts) and weaken the spark
Below is my troubleshooting procedure, gotta run I will check back later
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