Car wiring harness maintenance requires targeted measures based on specific problems. Common faults include aging and damage, connector corrosion, short circuits, open circuits, etc. For insulation layer damage, small areas can be wrapped with insulating tape (covering more than 5 cm on both sides of the damaged point); for large-area damage, the wire should be cut, connected with cold-pressed terminals, and insulated with heat-shrinkable tubing. If the damage is severe or located in key parts (such as the engine compartment), It is best to replace the entire section of the wiring harness. For connector issues, use sandpaper to remove the oxide layer and spray conductive paste; if corrosion is severe, replace with a new connector of matching specifications. When troubleshooting short circuits, disconnect the negative terminal of the battery and use a multimeter to test section by section. After water ingress, dry with a heat gun below 60°C and apply waterproof sealant. Maintenance tools include a multimeter, wire strippers, heat-shrinkable tubing, etc. Be sure to disconnect power before operation, and test functions such as lights and signals after repair. Inspect the wiring harness status regularly every 20,000 kilometres, avoid crushing damage during modification, and keep the interior dry to effectively prevent faults. When soldering wires, use rosin-core solder, ensure the solder joints are clean and free of grease, and perform insulation treatment after cooling.
