OK, first you can wire a solenoid backwards depending on the design of the solenoid. Disconnect the small terminal wires from the solenoid and see what it does. If the problem persists try taking any wires on the large terminal that are not the batter cable off or swap them to the other large terminal.
2nd: you don't say if it's a one wire or 3 wire conversion. If it's a 3 wire is there a disconnect or diode on the small wire that that comes back to the tractor? That wire can back feed. Most often the problem there is the tractor won't shut off but if wired different it could excite the solenoid.
If you go to the Ford page here on YT there are several people who are very good with electrical problems.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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