I was mowing with the old Yazoo yesterday and it just stopped dead in its tracks. 18 hp Kohler. Pulled a plug wire and no spark. Started looking at safety switches and such, then unplugged a 2 connector plug, I surmise the ign wiring, and cranked it and it starts right up.Plug it back together and it dies. Any ideas? I jumped the connectors for the ign switch. but to no avail. I'm stumped, but this has to be simple.