Originally Posted by triplestrength
Look at the wiring diagram it is in the same circuit as the ignition, however believe what you want.
I have the Triumph service manual and wiring diagram in front of me.
The "kill switch" cuts power to the fuel pump relay, leaving all other circuits and sensors energized to deal with basically a stalled engine.
The ignition switch circuit is much more involved, interfacing with the ECU, ignition, fuel, and sensor circuits.