How To Check Current Draw On Car Battery. You should now see current drain measured in Amps. Then attach the test light probe to the cable that came off the battery.
Put the test light between the post and the ground wire. Start by taking off the negative battery terminal off of the battery. In order to accurately detect the parasitic draw you need to begin with a fully-charged battery.
Times based off batteries in excellent condition at 100 beginning charge.
This is where we can see the parasitic draw on the battery. This varies meter to meter. It is quite convenient to measure leakage current clamp meters no need to disconnect anything. To measure the car-off current draw youll need a multimeter capable of reading current preferably one with a 10- or 20-amp.
