I have a IS1000Z zero turn Ferris mower with 800 hours that I maintain myself. Two weeks ago while in use, I had the mower die while stopping to open a gate. The mower would not turn over. I obtained a schematic on line and went over the machine. The seat switch, parking brake switch and neutral switches checked out on the continuity meter. There are two relays and they seemed to work when voltage was applied. The key switch checked out on the meter. When I wired the start terminal of the key switch to the starter solenoid, the engine turned over but would not fire. I began to trace the circuits and things seemed OK except for when I got to one circuit at the parking brake switch which read 84 ohms instead of zero. Eventually it occurred to me to pull both relays out and connect the start terminal of the key switch to the starter solenoid. The mower runs fine now with no safety switches working. Maybe no switches is a good thing and I should stop here. I'll go back and test again, to see if I have the same results but any random thoughts would be appreciated.