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Here is what I believe the easiest way to disable the car. You can use any kind of switch you like- toggle, key, etc. What sort of coil do you have? I ask because the switch has to have a high enough amp rating to run the coil. The car will crank but not start.The disadvantage of this circuit is that if the ignition switch is left on by the thief, then the coil is left on, and could over heat, but I've been using this system on various cars since the 60s with no problem. It works by shorting the points. If the points don't open and close, then the coil doesn't work- it must be pulsing DC to create a continuing spark. KILL SWITCH (3).pdf