Get a friend (or use a remote starter if you have one) to start the car. The crank cycle test shows how well the battery performs when delivering voltage to the starter motor. Check the manufacturer datasheet for details. Note: An AGM battery may display a higher voltage. This could mean your alternator had overcharging issues. If the batterys voltage is over 12.9V, then your car battery has excessive voltage. Alternatively, you can buy car battery chargers to charge the battery back to its minimum voltage.Īfter recharging the low voltage battery, test it again to see if it holds the charge. Try driving your vehicle for at least 15 minutes to bring the low voltage back up. If the battery voltage is below 12.2V, it needs to be recharged. Some electrical system might have drained it, or your alternator has trouble charging. If the reading is less than 12.4V, it doesn’t necessarily mean you have a bad lead acid battery, just low voltage. Check Voltage With Engine OffĪ good battery should have a resting voltage between 12.4-12.9V. Note: If you get a negative reading, it means your probes are swapped, and you just need to switch the battery post they’re touching.
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