what does the kill switch do?

[gator joe]

I agree it sounds like its shorting out somewhere. It could be a bad switch ot a bad wire or bad connection but something is definitely causing it to short

 

[KCvale]

I agree it sounds like its shorting out somewhere. It could be a bad switch ot a bad wire or bad connection but something is definitely causing it to short

or causing it to open (bad plug cap, plug wire), either will kill the engine.