How much is the car’s leakage current normal? How to measure the car’s leakage with a multimeter

The leakage phenomenon we are talking about today can be said to be extremely normal. But the car leakage current has a normal range value. If it exceeds, it will not only affect the normal operation of on-board electrical appliances, but even start the engine is also a problem. So, how much of the car's leakage current is normal, and how does the multimeter measure the car's leakage.

The normal value of vehicle leakage is generally around 40mA. Of course, this still depends on the model. It is possible for some high-end cars to reach 80mA.Then, the reason why the car has dark current is because there are some electrical appliances in the car, which need to keep the data memory function at all times (such asAudio, Air conditioning, etc.), and the anti-theft sensor also needs long-term power supply to ensure the car’s alarm function. So this can explain why there is a leak in the car.

multimeterCheckMeasure car leakageA step of:

1. Turn off the ignition switch of the car first, and wait for 5-10 minutes in the locked state, so that the car is in a dormant state.

2. Then find the fastening nut of the negative electrode of the battery and use a wrench to unscrew it. Then use a flat-blade screwdriver to slowly pry off the fastening block, and then directly pull out the negative connector.

3. Then it comes to the multimeter testing part. Switch the multimeter's measuring distance to DC 10A or 20A. Connect the red test lead of the multimeter to the body ground wire, and the black test lead to the negative pole of the battery.

4. Finally, just observe the value of the multimeter directly. If the value is in the normal range, it means that the leakage of the car is normal.

But if the car leakage is 0.09a or more, it must be abnormal. It is likely that there is abnormal leakage in the anti-theft circuit or other circuits. At this time, we need to follow the vine and eliminate them one by one.So, the most straightforward way is to remove the correspondingfuseTo troubleshoot, for example, after the anti-theft fuse is pulled out, if the leakage value returns to the normal range, it means that the circuit does have a ground leakage fault, and it needs to be dealt with in time.