If you find yourself stranded with a car that won’t start, there are a few things you can do to turn it off without a key. The first thing to do is check the battery. If the battery is dead, the car will not start no matter what else you try. Next, check all of the fuses. If one of them is blown, the car will not start even if the battery is good. Finally, try turning off all of the car’s electrical systems one at a time by turning off each switch or connector in sequence. ..