the run /kill solinoid has two curcuits to it , one change pull which energizesthe magnet and pulls the plunger over , once the oil pressure gets up the second curcuit , which is the hold curcuit kicks in and the pull lets go , the 753 had a couple of different versions of wiring for the run/kill solinoid , the earliest ones got the pull voltage from the starter , as long as the starter was spin then voltage was going to the pull , later models starting using timers , you can tell if you have the timer if there is a removable wiring harness between the solinoid plug and the main wiring harness , these had a fuse holder built into them------------------------------------------ if money is an issue it can be easliy fixed by installing a push pull cable from an old lawn mower throttle or choke and do away with the solinoid , this would be the same as the 743 series , only thing is that the low oil pressure , high water temp , hydraulic pressure shut down would not be able to function