Spooky season brings horror movie marathons where zombies wander around groaning for brains, but inside a repair facility, technicians are usually pacing around groaning about electrical drains. It sounds like a joke, but a parasitic battery drain is one of the most frustrating problems a vehicle owner can face. You turn the key in the morning, hear nothing but a click, jump-start the engine, drive to work, and think everything is fine—until the next morning when the exact same dead battery situation happens again.