What causes car wiring harness to go bad?

The wiring harness is an important part of your car's electrical system, so it must be replaced if it's not working properly. It is made up of wires, terminals, and connectors that transmit power and information through a vehicle or device. Although wiring harnesses are important, they are often overlooked when it comes to maintenance and inspection. Here are the 5 main reasons behind its failure.

1. One of the main causes of wire harness failure is manufacturing defects. These defects may include inferior materials, incorrect assembly, or insufficient insulation. Manufacturing defects often result in shorts, breaks, or intermittent connections, which can lead to equipment failure or even fires.

2. Corrosion is another common cause of cable harness failure. Exposure to moisture, road salt, and other chemicals can cause corrosion on wires, terminals, and connectors. This corrosion can cause increased resistance, which can lead to poor performance or even complete failure of the wiring harness, preventing your car from starting.

3. Vibration and physical damage are also important causes of wiring harness failure. Continuous vibration from a vehicle's engine or rough road conditions can cause wires to rub against each other or against nearby components, causing insulation to wear or wires to break. Physical damage can also result from collisions or improper handling during installation or maintenance.

4. Exposure to high temperatures can cause thermal degradation of cable harnesses, leading to insulation breakdown and wire damage. This can cause short circuits, open circuits, or intermittent connections, which can lead to equipment failure or even fire.

5. Rodents, such as mice, can be a surprising cause of wiring harness failure. They are known to chew through insulation and wires, causing shorts, breaks, or intermittent connections. Rodent damage is difficult to diagnose because it often occurs in hidden or hard-to-reach areas.
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