How to Test for Electrical Leakage in a Car?

[DelVincent]

Use a multimeter to test for electrical leakage in a car. Here are the detailed steps: 1. First, inspect the appearance of the battery's observation hole to check for any signs of electrolyte leakage. 2. Use a multimeter to test the battery voltage and charging output. A normal voltage reading should be above 12V. After continuous discharge for 10 seconds, the voltage should not drop below 10V. 3. Turn off all electrical devices in the car, lock the doors, windows, and trunk, and disconnect the negative terminal of the battery. Wait for 20 minutes, then connect one end of a test light to the negative cable and the other end to the negative terminal of the battery. If the light turns on, it indicates that electrical devices or wiring are still leaking current. In this case, check the relays and fuses. 4. Alternatively, connect the red probe of the multimeter to the car's chassis ground and the black probe to the negative terminal of the battery. Wait for 30 seconds. If the reading on the multimeter is below 50 milliamperes, the battery is functioning normally. If the reading exceeds 50 milliamperes, it indicates an electrical leakage issue in the car.