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2022
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Causes of damage of automobile wiring harness
1. The wire is not selected according to the regulations when replacing the wire of the car harness (the wire is too thin). When the large current passes through, it will generate large voltage drop and heat, resulting in the gradual aging and damage of the wire skin;
2. Careless installation of the battery, reversed connection of the positive and negative polarity, short circuit in the alternator, damage of insulation gaskets and insulation sleeves, and reversed connection of the alternator field wire and grounding wire will cause the harness to burn;
3. The car harness is often fixed with thin iron pickup, with sharp edges like knife edges, and the surface of the pickup is not insulated. The vehicle vibrates and bumps during long-term driving, and the power harness is inevitably worn, cut and grounded, resulting in the harness burning;
4. When the car harness is temporarily connected to the electrical equipment, the current inlet and outlet of the fuse are not clear, that is, the power line is led out at will, or the fuse of the same specification is not replaced as required after the fuse is burnt, or the fuse is replaced with thick copper wire, which loses the protective effect and burns the harness;
5. The two connecting posts of the ammeter are usually made of plastic insulating sleeves. The plastic heat dissipation is poor, so it must bear both current and bumps and vibration. If the wiring of the ammeter is loose or poorly contacted, it will lead to temperature rise, resulting in melting and grounding of the plastic, and burning of the harness;
6. The connection of the connecting post is not reliable, resulting in large voltage drop and heating. Over time, the insulation gasket will be damaged and the grounding will be short circuited. Note that the connecting post behind the ammeter and other instruments should be connected properly. In addition, the wire connecting screw fixed on the frame wiring board should not be too long to avoid grounding and burning the harness.
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