Dropping below 14 means either the battery is weak and unreliable for sustained vehicle operation or the alternator is failing. Then, compare it to the voltage figures below. Its a good idea to write down the reading. With the motor running, the multimeter rating should stay in the 14 to 14.5 volt range. Turn the vehicles key to the run position and check the multimeter. Immediately following the crank cycle, the vehicle will begin to idle and maintain a steady draw from the battery. Vector battery symbol set different level of charge for ui energy symbol mobile phone, battery charge signs. Again, in this case, recharge or replacement of the battery may be necessary.
If it falls below 10 volts, it means the battery does not have sufficient turnover strength and is prone to failure.
As soon as the car is turned on, the voltage reading will drop for a quick moment, but should not fall below 10 volts. To get this reading, a second person will be needed for the purpose of starting the ignition. This is the moment that the vehicle is turned on and the battery is under the most draw because of the higher amount of energy needed to drive the starter motor. Once the resting voltage has been determined, it is time to get a reading on the crank cycle. If the measured reading is less than 12.2 volts, the battery’s resting voltage is weak, which means it most likely needs to be charged or replaced. This voltage range means the battery is in good condition for starting the vehicle. When the probes touch the terminals while the car is off and the battery is resting, the multimeter display should show a reading of 12.2 to 12.6 volts (full charge). The red probe is for contact with the positive terminal and the black probe is for contact with the negative terminal. For measuring battery load, the multimeter has two probes: red and black.
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