Bought a 1992 walker MC with no motor 2 years ago. Bought a new motor for it and installed it with no unexpected issues. Mower worked great the last 2 years, but this summer started giving me trouble. PTO will shut off in the middle of cutting or sometimes not turn on. Sometimes mower will not start. Did some investigating, found that there was a red wire that melted out of the wiring harness that plugs into the ignition switch. This wire is attached to the positve battery lead on what i think is the starter solenoid, then goes to a fuse and then to the starter. I cut out the wire and ran a thicker guage wire from the fuse to the starter. Had no problems for a few hours of cutting until the insultation started to cook off the wire. The terminal on the ingnition that this wire hooks up to is the only one that is rusty (maybe from the heat...dont kno). I was going to by a new harness but i am worried it is just going to cook it again. Could this be because all the safety's are disconnected ( like do they cause extra resistance driving the current down and therefore the heat). Is it maybe a problem with the ignition switch? Any one have any ideas or any experience like this? Thanks for any help.