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Try unbolting the starter while still wired up and strap it to the driveshaft/spring and see if it spins when you press the button. Yes: could your engine be stuck or a piece of the nose went in the bellhousing jambing the flywheel? No: starter motor is no good.

Measure the voltage at the starter solenoid stud with the start button pressed just to eliminate the possibility of bad batteries. If you still have 24 volts, my guess is the starter someone sold you may be wrong.

If you had the large gauge cables backwards, there would have been fireworks when you reconnected the batteries. Check that you indeed have +24 at the solenoid stud with a voltmeter. If so, the starter could be defective.