How to Check for Car Battery Drain?

[FelixFitz]

To check for car battery drain, follow these steps: 1. Turn off the ignition switch to put the car in a dormant state; 2. Locate the negative battery terminal's tightening nut, loosen it with a wrench, then gently pry open the tightening block with a flat-head screwdriver and remove the negative connector; 3. Set the multimeter to DC 10A or 20A range, connect the red probe to the vehicle's grounding wire, and the black probe to the battery's negative terminal; 4. Observe the multimeter reading. Common causes of car battery drain include: 1. Electrical switches left on when parked; 2. Short circuits or oxidation/detachment of battery plates; 3. Grounding issues with electronic components or circuits.