Can A Car Alarm Kill Your Battery. If the connection lasts long enough it can draw the battery until it is dead. The not-so-common problem that can cause a battery sap with a car alarm is a short circuit.
Even while your car is off your battery provides power to things like the clock the radio and the alarm system. Most cars make the alarm system go off when the battery is replaced - or when the battery is run completely flat then jumped off. OK sorry OP and Peter but a correctly installed alarm will not drain your battery.
15 Tacoma PreRunner V6 SR5 Auto.
It generally happens later in the life of a battery. While I would tend to agree with people who think that the blinking security light will not drain a battery it is not helping your battery to stay alive. I meant that an alarms drain is more than just its LED. The charge to the system gets pulled out of the circuit and grounded into the car part or frame.
