I just mounted a continous duty solenoid and batter in the trunk of my sons car. I wired it to kill all power if the lead in the inside is not grounded. This wire will go to a toggle switch wired to a ground. After thinking about the computer , radio and anything else that might do better with a constant power supply, I ran a wire from the battery side of the solenoid to the engine side. This wire now has a 20 amp fuse, but I think I will upgrade to a circuit breaker, which will reset in the event someone tries to start the car without throwing the toggle switch.
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