the wire you will need to cut, is coming out of the ignition switch.
in order to locate it, you will have to use a voltmeter or a test lamp.
the wire you are looking for will be the one showing 12V (or more), when the ignition key is at the on position. make sure the wire has 12 volts on it even when you crank the engine.
the wire should loose power when you turn the key to the off position.
if you will tell us what year is your car, i might even give you the wire color.
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