Insert the red lead for the voltmeter into the connector identified as “Volts.” Place the black lead for the meter into the connector marked as “com.” Turn the switch on the meter to the position of “DC Volts.”
Touch the red lead to the positive terminal on the battery. Connect the black lead to the negative terminal.
Read the value in DC volts on the face of the meter.
Observe the following values to assess the condition of the battery through the meter reading. A voltage value of 12.7 volts and above indicates a 100 percent charged battery. The voltage reading of 12.4 volts will indicate that the battery is only 75 percent charged.