The most effective way to find car leakage

Such questions from some people: how to check the leakage of the car battery? Now I will share with you how to check the car leakage in the most effective way.


1.ToolsPreparation


Multimeter


1. IndividualOperatingSteps


1. Check whether the car battery voltage and power generation is normal, and whether the car battery pile head is seriously rusty. Many car owners think that the leakage result is a battery problem, or a generator problem;

2. Ask the owner if there is any maintenance, installation, or collision disassembly for the car;



3. Remove the negative pole of the battery, turn the multimeter to the maximum current range, connect the red stylus to the negative line, and the black stylus to the battery pile head and fix it;




4. Close all electrical appliances inside and outside the car, lock the door, observe the current size, adjust to the appropriate gear, and record;

5. Wait about 20 minutes; after all the modules of the vehicle enter the dormant state, read the accurate static discharge current;

6. The static current is generally 0.03A (namely 30mA), please refer to the maintenance manual for details, normally not more than 50mA;

7. If the static current is too large (as shown in the figure above),  we can check through the method of pulling out the insurance and relay, that is, pull down the insurance one by one, observe the size of the static current; (If it does not change, plug in the fuse or relay. )

8. If the static current of a certain insurance or relay is turned into a normal value, then we will look for the circuit related to the fuse to find the place of leakage; (if it is a relay, also check whether the relay itself is faulty, that is, the contact is burnt.)

9. If the static current drops but does not reach the normal value after pulling out a certain insurance or relay, we will record it at this time,  then plug it back, and continue to plug in other insurance and relays, because there may be more than one leakage;

10. After repairing, remove the multimeter and install the battery head negative electrode.


3. Leakage places that are not easy to find

1. Tail box light 2. Utility box light 3. Cigarette lighter


4. A simple calculation method

According to P=UI (power=voltage*current) to calculate the electrical appliances of the approximate power, , such as the above 14*0.3 we can calculate the electrical appliances of 4.2W, we can consider whether the small light is not off, or what module is working.


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