Since the new coil is getting hot as well, your coil is receiving 12V when it should only be getting 6V.
Did you do any rewiring recently?
Tractors of that era usually had a "boost" circuit that provided 12V to the coil during starting. It can be incorporated into the key switch, or it may be drawn off the solenoid at the starter, or if the tractor's new enough, it may be a relay that is activated by the starter button. I am not familiar with your tractor model so I don't know which it could be.
Perhaps the boost circuit is getting stuck on?
The other possibility is the ballast resistor failed, or has been removed.
Replace the ballast resistor, or replace the coil with one specifically designed for use with 12V without a ballast resistor.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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