How To Detect Battery Drain In Car. You should now see current drain measured in Amps. Usually when the car is resting any battery current draw above 500 milliamps is regarded as Parasitic but this can vary between cars especially with modern cars.
For years it will start the car in all sorts of weather. That seems like a tiny amount but a single incandescent dome light pulls enough power to drain a battery in one day. Move to the lower Amp setting on your multimeter if the current is lower than the setting on the Multimeter Low setting.
Next youll want to attach your amp meter in the correct series to your.
Your key enters the ignition switch and with a flick instead of the purring of the engine you hear the rat-a-tat-tat sound. Nevertheless if the difference between the more cells readings ranges between 25 to 50 points then this is a sign of battery drain. Disconnect the batterys ground cable and wire the ammeter in series between the battery terminal and the cable. Attach the AMP meter to the battery.
