Battery Guard 2000 constantly monitors the available battery power when the engine or charging system is off. If the battery voltage drops below 12.1V a voltage sensitive timer is triggered within the ECU. If the available battery voltage remains below 12.1V uniformly for a full 4 minutes, the ECU will pulse the Intellitec latching relay and the battery will be disconnected, to GUARANTEE STARTING POWER. At this stage there will be no power at ignition, the vehicle operator must press the flashing reset switch and power to ignition is restored. The operator can also manually disconnect the battery by pressing and holding the reset switch for 3 seconds.