How To Check Amp Draw On A Battery. A basic device is all youd need for a parasitic draw test with a multimeter. See here how to check battery charge.
The next step would be to pull fuses one by one until you see the amp draw. Next connect a amp meter or test light in series with one of the positive leads and a battery the test light is easier because you can observe while you pull fuses. Start by removing the negative side battery cable from your car battery this is the black one.
For a given capacity C and a discharge current I the time will be However battery capacity decreases as the rate of discharge increases.
This means that if you for example connect the meter to a circuit with a 20 amp draw you can blow up the meter. One might take the car for a long drive but the battery will not charge. There are a slew of multimeters on the market from cheap Chinese-made testers and Craftsmans up to high-end Flukes. - Remove the ground terminal from the other battery.
