How to check a car battery using a multimeter. Does your car not start, do you have dim headlights or interior lights, does the starter sound weak when starting the engine, or does your car die sitting overnight? This video will show you a few ways to test your battery to see if it is bad, is going bad, or is good. A good battery will hold a charge at around 12.6v and while the car is starting it won’t drop below 8-10v.
To check this, you will need a voltmeter select the 12-volt setting and connect the red wire to the battery positive and the black wire to the negative battery terminal. The reading should be 12.6 for a fully charged battery. As the voltage drops then, the battery condition has deteriorated.
Battery Voltage and the State of Charge:
12.66v . . . . . . . . . . 100%
12.45v . . . . . . . . . . 75%
12.24v . . . . . . . . . . 50%
12.06v . . . . . . . . . . 25%
11.89v . . . . . . . . . . 0%
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