kill switch is black and white wire, connector is between E box and carb, on right side of hull standing in tray.
connectors get dirty, maybe its pinched.
pushing the red button, should put the white and black wires together, and killing the spark.
disconnect black white wires at connector, put meter into the end going towards teh pole, put on the Omega ( ohm) resistance setting, push red button. should go fron infinity to nearly zerop when pressed.
if it doesnt, youve got wire, connector, switch issues.
take a paper clip, insert into OTHER end of connector going towards E box, that shoudl kill the engine when its running.