Abstract: An anti-theft alarm system employing a timer having a normally closed timer switch which opens automatically within a selected time interval after the timer is energized, a normally deenergized relay having a winding and a set of normally open contacts, an ignition switch, an electrically operated alarm, plurality of trigger switches connected in parallel which are normally open and a battery. First means connect the main switch, timer switch, trigger switch and winding in series across the battery; second means connect said main switch, the alarm and the set of contacts in series across the battery; and the timer is connected in parallel with the winding of the relay.