Pretty simple Dragonrover, devise a way to remove the power to the ignition. Two ways are available from the factory; turn off the ignition or pull the fuse. If you turn off the ignition, you lock the steering wheel, wrong answer! If you put the ignition in ACC it unlocks the wheel therefore pulling the fuse is all that is available from the factory. A fuse switch is a device that allows you to remove the power from reaching the ignition. Cutting the wire that supplies power to the ignition and installing a switch in it is another possibility but not quite as easy.
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