1. Security issues:

Whether repairing or adding new car wiring harnesses, the car's battery should be removed to avoid damaging the circuit due to a short circuit. But if some diagnostic tests are being conducted, batteries may need to be tested for lights or multi-layer testing.

In addition, when starting maintenance work, it is necessary to first check the overall wiring and pay attention to whether there are any faulty connections. If you see any wires being chewed or rough, do not touch them as defective wiring harnesses can be very dangerous.

2. Understand the circuit:

At present, cars have computer-controlled circuits, which is challenging. Understanding the circuits is crucial when repairing car wiring harnesses. There are several low-voltage signal transmission methods in modern vehicles. If they are accidentally welded too much or spliced too long, it may add high resistance to the system, leading to signal errors and computer calculations.

3. Matching line gauge:

It is necessary to have a basic understanding of automotive wiring harness specifications and select wires that match the corresponding signal, switch, or circuit specifications. For example, the headlights run on a fine gauge, while the battery runs on a thick gauge. Always match the wire gauge with its function. Thin wires can cause power surges, while thick wires can increase the resistance of the current path.

In addition, it is necessary to understand that the length and specifications of the automotive wiring harness determine its current carrying capacity, and as the distance from the source increases, the diameter must also increase. As the distance increases, the voltage drop will also be higher. In order to counteract this voltage drop over long distances, thicker specification wires need to be used.

3. Disconnect the car wiring harness:

If you want to replace or repair the safety wire in the car harness, you must be very careful to remove the wire. Strong pulling can damage the saddle and connector, and be careful when bending cables and connectors.

4. Avoid using solid core wires:

The vehicle is constantly subjected to vibration and impact, which may damage the hard solid core wire. Although the car wiring harness can be used normally for the time being, it may cause adverse problems.