1. Wire harness burned out. Wire harness burning accidents usually occur more suddenly, and the burning speed of the wiring harness is faster after burning up. In these burned cables, there is usually no safety device. In the cable of power system, once burning failure occurs, it usually burns to the iron-laying part, so the iron-laying part distinguishes the damaged cable from the complete intersection point. If the wiring harness burns down until it reaches the wiring part of the electrical device, it proves that the electrical device has malfunctioned.

 

2. Short circuit, open circuit and bad contact occur between harness and cable. External collision and extrusion of wire harness and cable can easily lead to damage of insulation protection layer, short circuit fault of cable, loss of control of corresponding electrical components or fuse fuse. When judging this, the terminals or connectors connecting the electrical devices or switches at both ends of the harness can be removed, and the faults of the cables can be detected by special instruments such as multimeters.

 

For the cable breaking fault, in addition to the appearance can directly judge the breaking phenomenon, but also often occurs at the terminal and cable junction, and it is not easy to judge from the appearance. For suspected disconnected cables, it can be judged by tension test, such as when the insulating layer of the conductor becomes thinner, it can be confirmed that the conductor has been disconnected, or it can be detected by special instruments such as multimeter.

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