Discover How to Test Your Car's Battery Safely
Open the hood after the car engine is off, put on your protective eye-wear and gloves, and use the wire brush to clean the contacts on the battery terminals,
The voltmeter has only two color-coded cables. Red cable to battery positive terminal, black cable to battery negative terminal.
Now that the cables are secure on the car battery, load test the voltmeter. If the reading comes back at 12.4 or higher, the battery is still…