How To Check Car Battery Drain With Multimeter. Usually all portable devices supply DC Direct current. Set the device to read DC direct current voltage.
How to Check Your Car Battery with a Multimeter. To test whether an alternator is draining the battery with the cars engine switched off disconnect the cars electrical system leaving the battery only. Make sure you do not put the red.
Nevertheless if the difference between the more cells readings ranges between 25 to 50 points then this is a sign of battery drain.
Wait a few seconds to several minutes for the car to go into sleep mode ie. Connect the tester to the battery. Ensure the ignition lights and radio are off. After doing this set the dial to 20 volts so you will be able to measure 0-20 volts.
