A week ago I went to now my lawn. Got the tractor started and noticed my tires needed air. Shut the tractor off and then the fusible link went up in smoke. Not sure what could have happened since its been working fine for months now. Where do I start? Have the wiring diagram and the PDF that shows how to check the voltage regulator but I'm lost on the wiring. Tractor is a LT155 with 15hp Kohler, 3 position key and a 15a charging system.