The wire harness is squeezed and impacted by the outside, causing damage to the wire insulation in the wire harness, resulting in a short circuit between the wires, causing some electrical equipment to run out of control and the fuse to blow.
When judging, you can disassemble the wiring harness connectors at both ends of the electrical equipment and the control switch, and use a meter or test lamp to detect the short circuit of the line.
Wire break faults, in addition to the obvious breaking phenomenon, common faults mostly occur between the wire and the wire terminal. After some wires are broken, the outer insulation layer and the wire terminals are intact, but the inner core wire and the wire terminals have been broken. When judging, you can do a tensile test on the conductive wire and the wire terminal suspected of being disconnected. During the tensile test, if the wire insulation becomes thinner, you can confirm that the wire has been disconnected.
Poor line contact, faults mostly occur in the connector. When a fault occurs, it will cause electrical equipment to not work properly. When judging, connect the power supply of the electrical equipment and touch or pull the relevant connector of the electrical equipment. When touching a connector, the electrical equipment works normally and suddenly, indicating that the connector malfunction.