How to check car leakage, how to find car leakage?

The method of measuring the dark current of the car is also very simple, it is the same as the current of the circuit measurement, and the basic principle is to connect the ammeter in series between the battery and the car! The multimeter can be selected in the current gear, and the range of 15A can be! Then disconnect any polarity of the battery, and use a black and red pen to connect the battery and the battery wire.

First of all, there will be a momentary larger current, which is the car anti-theft system is working, and then it will slowly decrease, and it will not decrease after stabilizing at a certain value.

At this time, the reading of the ammeter is the amount of dark current, that is, the leakage current. The general value is normal within 30-50mA, and more than 100mA is abnormal.

There are two ways to detect whether a car is leaking: one is the current detection method; One is the empirical testing method.

Current detection method: detection steps Disconnect the ignition switch, remove the negative terminal wiring of the battery, adjust the digital multimeter to the ammeter (1a gear), then take two wires, connect one end of the two wires to the positive and negative meter pens of the multimeter respectively, and connect the negative terminal and negative terminal wiring at the other end respectively, and observe the value of the ammeter. Check whether the measured current value is within the normal range with the maintenance data.

If the measured current value is too large, it means that the vehicle has a leakage fault. Troubleshooting method Unplug the fuse wires one by one and observe the pointer changes. When the pointer no longer rotates when a fuse is removed, the point of fault is the circuit or electrical appliance that passes through the fuse.

As with the current detection method, by consulting the circuit diagram or checking the line direction, the damaged parts can be found along the line for repair.

Empirical detection method: detection steps Disconnect the ignition switch, remove the battery negative electrode wiring, and then touch the wiring with the battery negative pole column to observe the spark intensity. The stronger the spark, the more serious the leakage.

Troubleshooting method If the spark is weak, it means that there is a small current, and it should be focused on checking whether there is a virtual connection to the indoor small lamp, luggage compartment lamp, etc.; If the spark is strong, it means that there is a large current, and it should be focused on checking whether the electrical appliances are working all the time or whether the wiring is damaged and tie-up.

That's too general a question. For each road insulation detection, it is generally required that the insulation is greater than 2m to find that the insulation of a certain road is poor, disconnect the electrical appliances of the road, and then detect and locate the specific electrical appliances or the leakage of the line point by point.

Some cars will not be able to hit the phenomenon after two or three days, to the maintenance station but said that there is a problem with the battery, today I will share with you the detection methods and skills of car leakage, let's take a look!

Use a multimeter to check whether the voltage and power generation of the battery are normal and whether the battery pile head is seriously rusty, and many car owners think that the leakage capacitance result is a battery problem, or a generator problem;

2.Ask the owner if he has recently repaired or installed anything or disassembled in a collision**;

3.Remove the negative pole of the battery, dial the multimeter to the maximum current level, connect the red watch pen to the negative line, and connect the black watch pen to the battery pile head and fix it;

1. The quality problem of the battery itself is mainly the internal short circuit, that is, the short circuit between the plates, when the battery is sufficient, because of the internal short circuit discharge between the plates, the stored electrical energy will be consumed as thermal energy. Therefore, the first thing to judge is whether the battery itself has internal leakage consumption to make the battery voltage insufficient, the simple way is to detect the battery starting voltage or turn on the headlight load, press the horn and other high-current working electrical appliances, observe its working conditions, or check the battery terminal voltage to judge. The normal starting voltage should not be lower than volts.

2. The more advanced the car, with the increase of the electrical equipment of the car and the increase of the battery capacity, the dark current will also increase at the same time, and it seems that the dark current of the car will be larger and larger in the future. Taking F6 as an example, the method of measuring dark current is as follows: pull out the key, turn off all electrical switches, close doors and windows, and turn off all indoor lights.

Wait 5 to 10 minutes for the vehicle's multi-channel transmission control system to go to sleep; Loosen the screws of the battery negative connection wire, then use the multimeter current milliampere, the negative black wire of the multimeter is connected to the negative pole pile head of the battery, and the positive red wire is connected to the battery connection wire, and the dark current value can be read, normally speaking, the current number does not exceed 90 milliamperes.

3. If the dark current reading exceeds 90 mA or even reaches several hundred mA at this time, it means that there is leakage in the electric immobilizer circuit or other circuits on the car, which should be checked one by one. The easiest way is to pull the fuse check method, when the dark current value returns to the normal value when the fuse is pulled out, it means that the branch circuit controlled by the fuse has a leakage fault! Then follow the vine until you find the leakage part!

Check the observation holes of the battery and the appearance of the battery to see if the battery is leaking.

Users can use a multimeter to measure whether the battery voltage and power generation are normal, the normal voltage is above 12V, not less than 10V after continuous discharge for 10s, you can also turn off all the electrical equipment on the car, the door, the trunk is in a locked state, disconnect the negative electrode on the battery and wait for 20 minutes, and then connect one end of the dry bucket liquid test lamp to the negative electrode line of the battery, and one end to the negative pole column of the battery.

Precautions for the use of car pin flasher batteries.

Always keep the battery clean and dry, and keep the ventilation hole unobstructed. When oxides appear on the plates or chucks, they should be wiped clean and coated with a little butter to avoid corrosion.

The starter should not be used continuously, and it should not be used for more than 5s each time, and it should be used after two start-up breaks of 10 to 15s. The degree of battery discharge in severe winter shall not exceed 25%, and in summer shall not exceed 50%. Batteries with sufficient electrolyte should not be placed in the case of insufficient charging for a long time, and should be charged regularly, otherwise it will lead to scrapping.

The above content refers to Encyclopedia - Car Battery.

People's Daily Online-Autumn and winter weather is dry, and the car should be careful of static electricity.

It is often seen that the battery of the customer's electric car dies after two or three days of parking, and the vehicle cannot be started. Some customers can't even open the door of the remote control, so they can only use the key of the machine to open the door. When encountering this kind of problem, we first observe the observation hole of the battery and the appearance of the battery to see if the battery is leaking.

Then, a battery detector is used to detect the state of the battery and the amount of electricity generated by the generator. If the power generation is low, driving until late at night and the battery is leaking for a long time, this can lead to the above malfunction. The phenomenon of car leakage refers to the phenomenon that the battery gradually consumes power during the parking process of the car, which affects the start of the car and the electrical appliances work poorly.

There are roughly three reasons for automobile leakage: the first is that the electrical switch is not disconnected when the vehicle is parked, resulting in battery power consumption, the second is the electrical loss caused by self-discharge caused by short circuit or oxidation and detachment of the battery plate, and the third is the leakage of automotive electronic components and circuits due to tie-up. The cause of leakage is the aging of the high-voltage line, the loosening of the connecting part, the crack of the distributor cover, and the flashover of the cracked part.

In addition, some car owners have added electrical appliances to informal manufacturers, directly connecting to the car battery without connecting it through a safety cable. There are too many circuit interfaces in the car, and the possibility of leakage increases. Replacing the car battery if it runs out of charge is mostly the driver's own idea.

The main reasons for battery power failure are that the generator does not generate electricity, the power line is broken, the carbon brush of the generator regulator is damaged, the generator stator is damaged, the generator bearing is damaged, the battery is dead, the electrolyte density is wrong, the battery life is over, and the load is increased. It is cumbersome to use a multimeter to measure the on-off of the vehicle circuit, and it is more necessary to remove the parts for places that are inconvenient for direct measurement. Therefore, you can use a clamp meter to measure, and you only need to find the relevant line and wear the clamp meter to measure and judge, which is better.

There are many ways to check whether the car is leaking, there are mainly the following three methods, and the specific detection steps are as follows:1Current detection method.

1) Disconnect the ignition switch and remove the negative terminal wiring of the battery. (2) Adjust the multimeter to the ammeter (1a), then take two wires, connect one end of the two wires to the positive and negative meter pens of the multimeter respectively, and connect the negative terminal post and negative terminal wiring at the other end respectively, and observe the value of the ammeter. (3) Check whether the measured current value is within the normal range with the maintenance data.

4) If the measured current value is too large, it means that the vehicle has a leakage fault. 2.Resistance detection method.

1) Disconnect the ignition switch and remove the negative terminal wiring of the battery. Using an analog multimeter, the black pen is connected to the positive pole of the battery, and the red pen is connected to the negative level. (2) Adjust the multimeter to the ohm gear (L gear) to measure the total resistance of the whole vehicle.

3) If the meter pointer does not move and the resistance value is very large, it means that it is normal and there is no leakage; If the watch hand is deflected and displayed as a few ohms or more than a dozen ohms, it means that it is abnormal and there is a short circuit. 3.Empirical testing method.

1) Disconnect the ignition switch and remove the negative terminal wiring of the battery. (2) Touch the wiring with the negative pole post of the battery and observe the spark intensity. (3) The stronger the spark, the more serious the leakage.

1. Discretion:

Check the electrical appliances, navigators, anti-theft devices and other electronic devices in the car that consume power, and confirm that the battery power of these devices is still quickly depleted when they are not used for a long time, then you can be sure that the car is really leaking. At this time, it is necessary to go to the repair shop for professional inspection and maintenance.

2. Professional testing:

1. First of all, we must carefully observe the battery to see if there is leakage, and then use the testing instrument to detect the state of the battery, and also to detect whether the generator power is normal. The sufficient voltage of the normal battery should be above 12V, the density of the electrolyte should be 1, and the liquid level should be in the standard position.

For maintenance-free batteries, a discharge meter can be used to detect, and the voltage measured after continuous discharge of 12V voltage for 10s is not less than 10V. A discharge test can be carried out on a battery that is losing power to determine whether it is good or bad and whether it can be used continuously.

2. Turn off all the electrical equipment on the car, take out the ignition key, disconnect the battery with the anode wire, and connect the DC ammeter between the anode and the battery anode pile head (the maximum range is more than 2A), if there is no ammeter at hand, you can also use the test light of SW instead of the simulation test.

If the ammeter current is below 10-20mA, the test light begins to glow, and then gradually dims, and the filament is dark red or extinguished, it can be inferred that the car loses power. Otherwise, it is regarded as a body leakage fault.