OK that tells us that the starting circuit is probably good..
Next, put a voltmeter on the heavy battery wire at the starter.
If you have 12+ volts, try to start it and read VOM. No change ,solenoid or starter bad.
If it drops a lot then battery or wire is corroded in the crimps.
Ford use to use a auxiliary starter solinoid mounted on the inner fender. If no voltage at the starter then they are still using them. Try to start and see voltage again.
Good luck. (Doing my best ,not being there!)
Tom
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