Go to Sears.com on line  and get a wiring scematic for starters.
You will find this in the parts section I just purchased a new mower and was trying to figure out how to install a on off override for the seat safety switch. Got it figured out now after much fussing .The connecter that connects to 
the seat switch has a hidden shorting bar  built in to it so if you disconect the switch it shorts out everything just as if you were  not setting on the seat. I cut the wires on the in side of the harness and am ready to install override switches for the seat switch. 
FYI I will be using my mower to pull a trailer in the yard to clean leaves and having to start and stop the tractor just seemed plain dumb.  THIS IS TAMPERING WITH THE SAFETY FEATURES IF YOU DO THIS I have also made several other mods but thats for another day
                
 Larry
                
 March 2007