How Do I Turn Off My ADT Alarm Without The Code?

How to Turn Off a Security Alarm Without the Code Turn off the power to the alarm's transformer box, and then take out the battery. There are two possible locations for the transformer box: the basement or a closet; it should be hooked into an outlet adjacent to either the circuit breaker box or the fuse box. Turn on the breaker for your home's electrical system. Simply turning off the switch will cause your alarm to stop working.