As you probably know you have to wire your positive + battery cable to it , But you also have to run your alternator wire to it and then back to the alternator . Because when the car is running and you try to shut it off with the switch it will keep running of the alternator unless you run the alternator wires . Then it will shut right off ! There is also a sticky at the top of the page that should help you . It was posted by REEF . Good luck !!