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This may sound stupid, but wouldn't it be better to run your power supply wire for your ignition directly off the master cut-off switch. Directly killing all power to your ignition when the switch is turned off. Would seem easier to do than the alternator wire. I'm not an electrician either, so....I could be wrong.


The cut off switch won't kill the running car, the alternator will back feed power to the ignition though the "cold" side of the switch and the car will keep running.