In the circuit of the power system, wherever the grounding is made, the wire bundle will burn there. The junction between the burned and intact parts can be regarded as the point where the wire is grounded. If the wire bundle burns down to the connection part of an electrical device, it indicates that the electrical device is faulty.

1.Detection and determination of wire harness burnout faults
In the circuit of the power system, wherever the grounding point is, the wire bundle will burn there. The junction between the burned and intact parts can be regarded as the point where the wire is grounded. If the wire bundle burns down to the connection part of an electrical device, it indicates that the electrical device is faulty.
2.Detection and determination of short circuits, open circuits, and poor contact faults between lines
The wire harness was subjected to external compression and impact, which caused damage to the insulation layer of the wires inside the harness, resulting in a short circuit between the wires.When making the judgment, you can separate the wire bundles at both ends of the electrical equipment and the control switch, and use an ammeter or a test light to detect the short circuits in the lines.
Wire breakage fault occurs when the wire is disconnected. Apart from obvious breakage, common faults usually occur between the wire and the wire terminal. In some cases, after a wire breaks, the outer insulation layer and the wire terminal remain intact, but the inner core wire of the wire and the wire terminal are already disconnected. When diagnosing, a tension test can be conducted on the wire suspected of being broken and the wire terminal. During the tension test, if the insulation layer of the wire gradually becomes thinner, it can be confirmed that the wire has broken.
The line connection is poor, and most of the faults occur inside the connector. When a fault occurs, it will cause the electrical equipment to fail to work properly. During the judgment process, connect the power supply of the electrical equipment, touch or pull the relevant connectors of the electrical equipment. When touching a certain connector, the operation of the electrical equipment alternates between normal and abnormal, indicating that there is a fault in the connector.