![]() ![]() Then put one of the multimeter’s leads on the negative battery post and the other on the disconnected battery terminal. ![]() Choose 10A or 20A and make sure the leads are in the correct locations. Step 2: Turn on the multimeter and make sure it’s set for DC, not AC. ![]() You can do the test on the positive cable, but it’s much easier and safer using the negative side. Step 1: Remove the negative battery cable.Be sure to check your specific car’s wiring diagram first. However, some cars have multiple fuse boxes in the interior panels. Keep in mind that every car is different, so you might have two fuse boxes in the engine compartment and one on the driver’s side interior panel. When conducting a parasitic draw test, you’ll need to check all of the fuse boxes in your car. | (Photo by Michal Fludra/NurPhoto via Getty Images) Diagnosing the battery drain Car battery charging process using a smart charger. Having a friend to help could be useful, but it’s not really necessary. The parasitic draw test itself is simple and straightforward, but time-consuming. 8mm and 10mm sockets and wrench to remove the battery terminals.A multimeter – Must have an Amp (DC) reading of at least 10 amps.The test itself can take a few hours, so be sure you do this check when your schedule is cleared. If you suspect that your car has a parasitic draw then you can conduct a test using a multimeter and a few other simple tools. Some of the main causes of a parasitic draw include: Some parasitic draws are slower than others, however, they are always caused by a short circuit or an electrical device that remains “on” after the ignition is shut off, according to Axle Addict. | Getty ImagesĪ parasitic draw is when the car has a constant drain on the battery even after the car has been switched off. Let’s say the battery ends up testing as good, how do you check the car for a parasitic draw? What is a parasitic draw? An Advanced Auto Parts employee tests a car battery. But what if it happens every day? If so, then you might need a new battery or the car could have a parasitic draw. Have you ever gone out to your car to start it up, only to be met with flickering lights and a clicking sound? That most likely means that your car’s battery is dead.
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