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.
Kill switch relay wiring diagram.
Every time the ignition is turned off continuity is broken on the starter feed wire.
Normally closed starter kill.
Using your wiring diagram find the wire responsible for activating the starter solenoid and install a switch as far from the ignition as possible.
Starter kill passive with 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.
How to wire relay starter kill switch get the book at amazon.
It does not rely on an alarm or keyless entry for it to work only a simple momentary contact switch normally open to deactivate it.
How to use a relay as a kill switch or safety switch duration.
Ford to another relay when the alarm is armed and the ignition is turned on.
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Below is an ignition kill switch wiring diagram.
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.