If you want to trouble shoot it rather than throwing parts at it you need an analog voltmeter. Connect it to the resistor side of the coil and check the voltage while cranking. If it reads much less than 6 volts while cranking go to ignition switch side of resistor and read again. If it drops much below 12 volts keep working back toward battery till you find where you are loosing the higher voltage.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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