Yesterday after cutting for about 4 hrs., I killed the tractor for about 10 minutes. When i tried to start it again it made a clicking sound - a relay clicked in the start mode and it sounded like the solenoid clicked when I released to the run mode. After repeating several times, the PTO light came on and the starter wouldn't do anything. I checked the fuses(couldn't find but 2) and removed and replaced the relays. I functioned all the levers to check the safety switches and bypassed the seat switch. No luck. I also cleaned the battery terminals. After awhile the PTO light went off and the tractor cranked as normal. Today it cranked normally a few times but then once again refused to crank. After trying a few times I just held the start switch to try to function some levers, after about 5 seconds the PTO light came on again so I switched everything off. After waiting about 10 minutes I heard a relay click and when I tried to crank the PTO light was off but the tractor still would not crank. after trying a few times and the PTO light came on I left the key in the run position and after 10 minutes the PTO light went off and the tractor cranked as normal. Anybody have any ideas?