I just went out and looked at the tractor again. If I stand on the right side of the tractor and look toward the firewall, there are 3 fuses in the block; a 15 amp on the left, a 10 amp in the middle, and another 10 amp on the right. The one on the right is blowing. My tractor is a TC 30 V4. I see that the switch under the seat that is supposed to shut the tractor off if no one is on it has been bypassed. I have to assume my husband did that when he was alive. I've been driving the tractor for 3 1/2 years and it hasn't been a problem. It will start with nobody in the seat, and as long as everything is in neutral I can get off and leave it running, even with the PTO engaged.