1. Detection and judgment of electronic wire harness burnout failure. The burnout of electronic wire harness occurs suddenly, and the burning speed is very fast. Generally, there is no safety device in the burned out circuit. The law of electronic wiring harness burnout is that in the circuit of the power supply system, wherever the iron is grounded, the electronic wiring harness burns wherever it is. The junction of the burned out and intact parts can be regarded as the grounding of the wires; When it reaches the wiring position of a certain electrical equipment, it indicates that the electrical equipment is faulty.

2. Detection and judgment of short circuit, open circuit, and poor contact between lines

The electronic wire harness is squeezed and impacted from the outside, causing damage to the wire insulation layer in the power wire harness, resulting in a short circuit between the wires, causing some electrical equipment to lose control and the safety wire to fuse.

When judging, the electrical equipment and the electronic wire harness connectors at both ends of the control switch can be disassembled, and the short circuit of the circuit can be detected with an electric meter or a test lamp.

In addition to the obvious breaking phenomenon, the rare faults mostly occur between the wire and the wire terminal. After some wires are disconnected, the outer insulation layer and the wire terminals are intact, but the inner core wire of the wire and the wire terminals are disconnected. When judging, you can do a tensile test on the high temperature resistant wire and the wire terminal that is suspected of breaking. During the tensile test, if the wire insulation layer becomes thinner, it can be confirmed that the wire has been broken.

The line is in poor contact, and the fault mostly occurs in the connector. When the fault occurs, it will cause the electrical equipment to not work normally. When judging, turn on the power of the electrical equipment, touch or pull the relevant connector of the electrical equipment, when you touch a connector, the electrical equipment works normally or abnormally, and the connector is marked malfunction.