Every time the ignition is turned off continuity is broken on the starter feed wire.
Kill switch relay wiring diagram.
The basic starter kill relay diagram shown below breaks continuity of the wire from the ignition switch to the starter motor or in some cases i e.
Normally closed starter kill.
By using a wiring diagram for your car you should be able to find which wire is your ignition cable and determine the proper one to cut into.
This is the most commonly used application for disabling the starter.
This is a stand alone starter kill.
The trickiest option is an ignition kill switch.
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Starter kill passive with switch relay wiring diagram.
Using your wiring diagram find the wire responsible for activating the starter solenoid and install a switch as far from the ignition as possible.
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How to use a relay as a kill switch or safety switch duration.
Once the wire is cut you can either solder the 2 ends of the wire into the switch or use additional connectors and crimp it on no soldering required.