Had the same type of symptoms you described so I'd guess it's a starter problem, the sprag being the likely culprit. Do you notice a loud clanking sound as you turn off the ignition? I did in the few days prior to it giving up completely. It's not hard to remove the starter to check. It may even free up by just taking apart and cleaning up. The starter posive lead connector is also a weak link. If you've tightened it up at all the insulation may have moved causing a direct ground to the starter housing which would cause the wires to heat instantly as you described. That would not cause things to seize but you may have two issues to deal with. Once it's apart, it's an obvious problem.
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