Small Engine Troubleshooting Problems? Ask a Mechanic Now.
If you put wrench on the nut at the pto clutch, can you turn the engine?
If you can, try jumping the single small terminal on the starter solenoid , to the battery cable post on the same solenoid. The engine should spin if battery, cables and solenoid and starter are good.
Seat switch, brake switch, and pto switch all will keep starter from engaging.
Seat is two wire switch, just tie the two wires together.
pTo, switch it on as off as you hold key in start position.
It should only affect pto operation. I assume you have good fuse in the ignition circuit???