How to judge the water leakage of the car?

The method of measuring the dark current of the automobile is also very simple, just like measuring the current of the circuit. The basic principle is to connect the ammeter in series between the battery and the car! The multimeter selects the current range, and the measuring range is 15A! Then disconnect any polarity of the battery and connect the battery with the battery wire with a black and red iron pen.

At first, there will be an instantaneous large current, that is, the automobile anti-theft system is working, and then it will gradually decrease, and it will not decrease after it stabilizes at a certain value.

At this time, the reading of ammeter is dark current, which is leakage current. Generally, it is normal within 30-50ma, and abnormal if it exceeds 100ma. Of course, this current is normal for special vehicles or special equipment.