I bet you had some corrosion on the ignition switch plug. By removing and reinstalling the plug, the connector scratched off the corrosion to expose clean metal on the switch terminals to re-establish a good connection.
Sometimes it's a really simple problem like that. I have a tractor that the PO welded the electric PTO clutch inner race to the rotor because the PTO quit working. I cut the welds off to get it free again, and simply removed and reinstalled the connectors on the ignition switch and PTO switch and it started working again...
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