Hi MM
As I have so much trouble with the kill switch setup I do away with them but in your case I assume you want to try and keep it original. First think I would do is get the wire that goes through the side of the rubber boot out without disturbing the wire that comes into the end. This will isolate the kill switch so you can test for spark. If you don't have spark then it is time to fit an ignition module to it and that should bring the spark back