the mower has 70 hrs. the key switch wouldn't start when turned to start. I replaced switch with new one. still would not start, replaced solenoid, two relays under control panel still no start. now the 15amp fuse blows each time the key is turned to start. I also checked the safety switches on steering arms and seat. is there anything I'm over looking here? I should mention here the engine is a FR730V 23hp.