How To Use Multimeter To Test Alternator. The black probe onto the common socket and the red probe on the socket labeled V. Connect your meter leads on via battery terminals by looking for 138 to153 volts.
With the engine off battery voltage should be between 125 and 128 volts. Please you shouldnt disconnect the negative battery cable just to test an alternator. Connect your meter leads on via battery terminals by looking for 138 to153 volts.
If you just got a brand new battery and your car is not starting then you definitely have a faulty alternator on your hands.
Select the range based on the rated voltage of the desired device. A cheap multimeter or a voltmeter will be able to test your alternator without hurting your engine. Conduct a Voltmeter Test. Set the Multimeter to Volts DC.
