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Battery Drain on 2008 Toyota Tundra

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If I leave my 2008 Toyota Tundra parked for more than three days, the battery is dead. Mechanic told me that there is a draw on battery, but doesn't know where. Anyone else have this problem and how to fix it.
(1) Answer
The battery can become drained if your truck has the auto-shutoff headlights feature, and you leave the headlight switch in the "on" position and rely on the auto-off feature to shut them off. The relay that shuts off the headlights draws power from the battery.