I have a gt 5600 craftsman garden tractor. I had to put it on the charger the other day and it started right up.  I turned it off to disconnect the charger and went to start it again and I only get a click in the ignition relay.  Has anyone experienced this before?  Also, the flywheel will not spin freely by hand.  Possible motor seize? The tractor is only 4 years old and has had all general maintenance done in a timely manner.  Any ideas/suggestions would be greatly appreciated.  Thanks!!