Fired up my tractor, drove down to water my cherry tree. Left it running while with brake set and started watering tree. Tractor tuned off like I shut it off, not like it ran outta gas. Has plenty of gas/oil, battery measures good 0ver 13VDC and fuse is good.. I wrang out the switches (seat, brake, PTO) + they seem to be OK. Any suggestion? Anyone got a decent wiring diagram?