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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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