To measure the car-off current draw, you'll need a multimeter capable of reading You are now reading the parasitic drain on the battery. When your car battery goes dead overnight, usually either the battery is at the end If checking for a drain, the alarm should be the first thing to be disconnected to see if the circuit, which in turn will leave current flowing, draining the battery. Find out why your car battery discharges, applying these simple tests at Set your digital voltmeter to a low setting on the DC (direct current) Volts scale. . Repeat the leakage test to make sure the discharge has stopped.
Find that parasitic battery drain that's causing your car battery Depending on the amount of current being drained, a parasitic draw will suck. You can check your battery for leaks using a voltmeter or multimeter. Your browser does not currently recognize any of the video formats. So how do we know if you do have a parasitic draw, or if it is really just a current from the car battery, preventing it from being fully charged.
To check the battery voltage a meter is connected in parallel. This involves touching the black lead to the negative battery terminal and the red.