How To Use Voltage Meter On Car Battery. Using a car battery tester. Because your alternator is connected directly to your battery your meter will be reading battery voltage.
Turn the lights off. The meter should be reading in the 13 volt range to the 14 volt range. When you want to use a digital multimeter to check for Voltage you need to know which type of Voltage be it AC or DC.
Bring the RPMs to about 1500.
A fully charged battery should give out at least 126 volts so setting the dial to 20 volts is enough. Then your mechanic may either use a multimetervoltmeter or a dedicated battery tester. Connect the multimeter to the positive and negative battery. Because your alternator is connected directly to your battery your meter will be reading battery voltage.
