My dad has an older SW48-14KA that was running for hours and then I loaded it on trailer and when I brought it off it won't run. No spark to the plug. I checked the on off switch with a volt meter which is good but I am not sure how to trouble shoot from here on out. It is a pull start and does not have the hours meters. It is the belt driven and not the hydrostatic drive version. Any suggestions on how to trouble shoot? The leaves our getting thick here in Indiana and I need to get it running.