I am a bit worried you need to ask that. I will leave that to one of the experts on the forum to explain that. Just in case there are more than two wires at the first connecter block from the kill switch.
Basically if you take the kill switch out of the loop and connect the wires together at the connector block which is the far side of the kill switch loom and you get a spark at the spark plug your kill switch is fubarred.
(There could also be a problem with the ignition switch which can also be checked by bypassing it.)
A cheap electrical test meter is also your friend. Because you can check continuity of connection from point A to point B easily and safely without the need of any electrickery in the wiring.