Re: Kill switch not working
Not only check that the wiring is good but check that grounding the wiring will stop the engine. And test the switch to see if the switch closes
If all indications are that the switch is indeed faulty take it out and if it is possible to dismantle it and clean the contacts do so. If it's duff and you cannot fix it replace it, but cheap it is not!
(used to be a routine job on an old Volvo Penta I used at one time)