1) Detection and judgment of wire harness burnout fault
In the circuit of the power system, wherever the wire harness is grounded, the wire bundle will be burned. The intersection between the burnt part and the intact part can be considered as the wire ground there; if the wire bundle is burned to the wiring part of an 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 wire bundle is squeezed and impacted from the outside, causing damage to the insulation layer of the wires in the wire bundle, resulting in short circuits between the wires.
When judging, you can disassemble the wire harness connectors at both ends of the electrical equipment and control switch, and use an electric meter or test light to detect the short circuit of the circuit.
- Wire open circuit failure, in addition to obvious fractures, common faults mostly occur between the wire and the wire terminal. After some wires are disconnected, the outer insulation layer and wire terminals are intact, but the inner core wire and wire terminals are disconnected. When making a judgment, a tensile test can be performed on the conductive wires and wire terminals suspected of being broken. During the tensile test, if the insulation layer of the wire gradually becomes thinner, it can be confirmed that the wire has been broken.
-The circuit contact is poor, and faults often occur in the connector. When a fault occurs, the electrical equipment will not work properly. When judging, turn on the power supply of the electrical equipment and touch or pull the relevant connector of the electrical equipment. When touching a certain connector, the electrical equipment works suddenly and sometimes abnormally, indicating that the connector failure.