Since I took the fuel tank and steering box off yesterday to replace the steering column bushings, the engine won't shut down except by manually closing the inline shut-off valve in the fuel line. The key and seat switch don't work and the shut off procedure the manual gives you doesn't work either... it runs and runs and if that shut-off valve weren't there, it'd run till the gas is gone. I read in other posts that the switch depend on a ground connection somewhere, but I couldn't find it. There is a black wire with a spade connector end that has been loose but I can't find where it's supposed to attach to, and I think that's been disconnected for a while and isn't the reason for the key switch not working anymore. That just happened yesterday. I can live without all the other safety stuff, but the seat switch and the key switch...well, that's the bare minimum. Anyone have an idea what I could have done there?