It was running fine, shut it down for about 45 minutes, now won't start. I get one click turning the key. Checked the PTO was in correct position, as well as being in neutral. Seat switch down. Tried jumping the solenoid, starter spins but does not engage the flywheel. Took it off and brought it to Autozone. Tested ok. Put back on, still just the one click. If it was one of the safety switches, would that stop the starter from engaging the flywheel with the solenoid being jumped? I'm counting three safety switches, seat, PTO, and gear shift. Are there any others. Never had to depress clutch to start. Any ideas on starter or what to check next. New starter is over $600. Don't want to spend it if I don't have to. Best way to check the 3 safety switches?