How to Use a Multimeter to Test for Car Battery Drain?

[DelDelaney]

First, adjust the multimeter to the correct range. To measure car battery drain, rotate the knob to the current measurement setting. Next, select the appropriate range. For most cars, choose the 20A range, then insert the red probe into the socket marked 20A. After setting up the multimeter, turn off the car engine, shut down all electrical devices, and lock all doors. Then open the hood, disconnect the negative terminal of the battery, connect the red probe of the multimeter to the car body ground wire, and observe the current displayed on the multimeter.