How to Use a Multimeter to Measure Car Battery Drain?

[LaTyler]

Using a multimeter to measure car battery drain is as follows: 1. First, set the multimeter to the correct range. The multimeter has ranges for measuring voltage, resistance, and current. To measure car battery drain, rotate the knob to the current measurement range. 2. Next, select the measurement range. For most cars, the 20A range is selected, and then insert the red probe into the socket marked 20A. 3. After setting up the multimeter, turn off the car engine, shut down all electrical devices, and lock the doors. 4. 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 connect the black probe to the negative terminal of the battery. Observe the current displayed on the multimeter. A normal leakage current is below 30-50mA. If the multimeter shows a value exceeding 0.05, it indicates a significant battery drain in the car.