Others have identified the cause being that the starter is drawing down the battery supply so there is low voltage at the coil.
Weak battery or bad connections can be the cause.
One other possibility. Is this 6 or 12 volt system. I've seen a couple of tractors with 12 volt conversion kits give the same problem. The reason was that the supplied resistor for the coil was too high resistance. Should be 1.5 to 2 ohms, on one of mine it was 5+ ohms.
On mine I replaced the 6 volt coil with NAPA IC14SB -12 volt no resistor required- and eliminated the resistor. That cured the problem.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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