In automotive electrical terms, what does "parasitic draw" refer to?

"Parasitic draw" refers to a constant drain on the battery from electrical components when the vehicle is off. This phenomenon occurs when certain electrical devices, such as alarm systems, radio memory, or interior lights, continue to draw power even when the vehicle is not in use.

Understanding parasitic draw is crucial because excessive drainage can lead to a discharged battery, making the vehicle unable to start. Technicians often measure the current draw when the vehicle is off to identify if there's an abnormal draw coming from electrical components. Recognizing this helps in diagnosing battery-related issues and ensuring the electrical systems in the vehicle are functioning correctly without unnecessarily draining the battery.