I have a 1992 John Deere LX172 with a 14hp kawasaki engine. It has never given me any trouble until now. It was running fine the last time I was using it, but next time I tried to start it up, it wouldn't run. There was no spark so I replaced the coil and the igniter, but still there was no spark. I have continuity on the wire from the switch to the igniter but no voltage. Is the switch my problem or is it something else? Please help, thank you.