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What Is Parasitic Draw and How to Test for It

By Daniel Dillon, April 15, 2008

Parasitic draw or drain is a term for an electrical component consuming electricity when it should not, even after it and the vehicle has been shut off. This will cause the vehicle's electrical system to function improperly and the vehicle may exhibit one or more of the following symptoms:

  • A persistently dead battery
  • The engine may not crank over or it cranks very slowly after sitting over night

When these types of symptoms occur, it is important to have a parasitic draw test performed.

A parasitic draw test involves specialized electrical test equipment, computer system scan tools, specialized charging system test equipment, and specialized technician training.

Get it diagnosed by a professional

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