Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Yes, take two wires direct from the battery to the electric clutch wires under the engine. Then with the wires unplugged from the harness, ENGINE OFF , touch the two wires from battery to the two clutch wires, Does the magnet engage and hold? Clutch should pull less than 5 amps, so if wires get big spark, or get hot, the clutch coil is shorted and the clutch needs to be replaced.
No, either the pto switch is bad, or the pto clutch! Nothing else would cause the fuse to blow when you plug in the pto switch.
A diode is an electrical check valve, check it for continuity, it should have continuity in one direction only. You can buy a replacement diode at any electronic house, just get one with at least the same rating, or larger.