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One more observation about cutoff switches and security. Most of them can be activated when the key is removed by just pressing the center stump of the keyhole in with a screwdriver or even a house key. If you have one, turn the ignition switch on and try this with the cutoff - usually the dash will come to life. I was able to start my car this way then release the cutoff, ran for a couple of minutes until the computer decided it did not like that mode of operation and shut down. It does provide some security, but not what it seems.
If you use it every time you park, it can help with safety. An FFR and a major part of the owners home were destroyed by fire when an alternator wire shorted after the car was parked in his garage. A cutoff switch would have limited the damage, allowing the fault to be discovered while the car was in use.
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