Connecting wire harness daily use of precautions, connecting wire failure test methods

The connecting wire harness is one of the common harnesses in our daily use. When the service life of the harness is up, we will replace the electronic harness. In the process of replacing the electronic harness, we need to pay attention to several points. Here are the precautions for the daily use of the electronic harness. 1、 Electronic Harness Processing Appearance Inspection The replaced electronic harness should be consistent with the original one. Compare the new harness with the original one, such as the size of the harness, the connector of the wire terminal, the color of the wire, etc. The connection between the wire terminal and the wire should be reliable. Pull each connector and the wire by hand to see if there is any loosening or falling off. Processing, installation and use of 2、 electronic wiring harness For the installation of electronic wiring harness, the connector, plug and socket of each electrical equipment must correspond to the socket and plug on the wiring harness. After the connection of each connecting wire and electrical equipment, a certain margin should be reserved. The wire should not be too tight or too loose. 3、 Electronic Harness Processing Inspection and Test Electronic Harness Power-on Test The grounding wire of the battery may not be connected temporarily. Use a bulb of about 12 V and 20 W as the test lamp. Connect the test lamp in series between the negative electrode of the battery and the grounding end of the frame. Turn off the switches of all electrical equipment on the vehicle. It is also applicable to the inspection of the circuit before the electronic harness. After the replacement of the harness, first check whether the connection between the harness connector and the electrical equipment is correct, and whether the positive and negative poles of the battery are connected correctly.

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After the connecting line is processed, some tests should be done before leaving the factory, so as to check the product quality of the connecting line and avoid defective products leaving the factory. Some common faults in the use of connecting wires are short circuit, open circuit and poor contact, which can be tested and detected. Let's talk about the fault test method of connecting wires. 1、 that the outer insulation layer of some wire harnesses and the wire terminals are in good condition, but the inner core wire of the wire and the wire terminals are broken, which can also lead to the problem of open circuit of the wire, which can be detected by disassembling the wire harness connectors at both ends of the electrical equipment and the control switch, and using an ammeter or a test lamp to detect the short circuit of the circuit; The obvious fracture between the 2、 wire and the wire terminal is likely to cause the wire open circuit fault, and it may also be caused by the fact that the outer insulation layer and the wire terminal are intact, but the inner core wire of the wire and the wire terminal are open circuit. The open circuit of the wire can be confirmed by conducting a tensile test on the open circuit of the wire and the wire terminal when the insulation layer of the wire becomes thinner during the tensile test. When the general harness of the 3、 has the problem of poor contact, it is very likely that there is a problem in the connector. It can be detected by turning on the power supply of the electrical equipment, touching or pulling the relevant connector of the electrical equipment. When touching a connector, the electrical equipment sometimes works normally and sometimes does not work normally, indicating that the connector is faulty.

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