Are your sure the coil is still getting voltage when cranking?
Lots of older setups had a second wire feeding the coil, that worked only when cranking and also bypassed the resistor.
I would check the voltage on the primary side of the coil while cranking first to find out what is happening. And yes it may just be too low, or NOT be there at all. This will tell you how to proceed.
To throw more variables... the voltage test could tell you the starter is dragging and or the battery is weak or have too small of cables... but proof will be the voltage test at the coil.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
... [Read Article]
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