What are the methods for checking car electrical leakage?

[SaraDella]

There are two methods for checking car electrical leakage: current detection method and empirical detection method. The specific methods are as follows: Current detection method: Detection steps. Turn off the ignition switch, remove the negative terminal of the battery, set the digital multimeter to the ammeter (1A range), and then take two wires. Connect one end of each wire to the positive and negative probes of the multimeter, and the other ends to the negative terminal and the negative wire respectively. Observe the ammeter reading. Compare the measured current value with the maintenance data to see if it is within the normal range. If the measured current value is too high, it indicates that the vehicle has an electrical leakage fault; Empirical detection method: Detection steps. Turn off the ignition switch, remove the negative terminal of the battery, and then touch the wire to the negative terminal of the battery to observe the strength of the spark. The stronger the spark, the more severe the electrical leakage. Detection precautions: Because modern car electronic control technology is relatively mature and involves the memory function of electronic control units to maintain data, there will be a small current supply to maintain the work of the electronic control unit after parking and turning off the ignition switch. Therefore, a small current is normal. Different brands of vehicles vary, but generally speaking, the more electrical devices there are, the greater the current will be. As long as it is within the current value range specified by the manufacturer, it can be considered normal; Some mid-to-high-end cars now have an audio locking function. Therefore, without the relevant setting equipment and unlock password, do not easily remove the battery terminal; The empirical detection method is not suitable for checking all electrical leakage faults and can only roughly detect general electrical leakage faults. Therefore, it is best to use instruments and equipment to handle such faults; During the inspection, be sure to check whether the battery itself has a self-discharge phenomenon.