put the red lead from the meter into the sprak plug cap and test across the wire(s) some have two wires coming out of the back and some have one.
place the black lead on the wire it should read between 14.2-15
test the other wire it should read the same.
or if you only have one wire test the mounting bracket that it bolts to the frame, and the wire.To check for power at the coil hook a test light to the coil supply wire and try to start it.
Welcome to the forums. By looking at the wiring diagram, the kill switch is a normally open switch, so all you would need to do is unplug the two wires (black/white wire and green wire) from the switch.