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How Do I Know If My Wiring Harness Is Bad?

Aug. 09, 2021

Wiring Harnesses

 Wiring Harnesses

A wiring harness is the connectors, wires, and terminals that allow the mass to function of the electrical components of a system to be in optimum condition. In addition to keeping electrical components (i.e. headlights) running, it also serves as a barrier between certain electrical components of the vehicle and external hazards.

The automotive wiring harness prevents electrical and other types of damage to you and your vehicle. A vehicle that runs with a wiring harness will last longer than if each wire was run separately, giving you more durability. 

The automotive wiring harness plays an important role in your car, so it is a critical component that requires regular inspection and maintenance to ensure the safety of you and other drivers. If you suspect that your car's wiring harness is damaged, you should have it checked by an auto mechanic immediately, as a malfunction can lead to further complications and unnecessary expenses.


Common Symptoms of a Faulty Wiring Harness

Depending on the location and severity of the damage to the wiring harness, one or more of these symptoms may occur. Driving with this type of damage can lead to a variety of dangerous risks, including increased risk of fire and reduced visibility due to improper road lighting.


Headlights or tail lights not working

The automotive wiring harness ensures that electricity reaches the vehicle's headlights and taillights. If the wiring harness is damaged, it may cause the headlights or taillights to not work. Another sign is whether the lighting becomes dim, especially on a consistent basis.

Automotive Wiring Harnesses

 Automotive Wiring Harnesses

Certain electrical functions stop working

If any of your car's electrical functions don't work, this could indicate a broken or damaged wiring harness. These could be functions such as the battery, lights, or alternator.


Ignition Failure

Ignition failure can be a sign of a damaged wiring harness, whether it's a common problem or just a one-time occurrence.


A dead battery or starting problems

If your car's battery is dead, or if it drains quickly, this is a sign of a faulty wiring harness. Likewise, if your car accelerates or idles unexpectedly, or if it leans and stutters while driving, it's another sign of a damaged wiring harness.

Wiring Harnesses

 Wiring Harnesses

Common Causes of Wiring Harness Deterioration

Just like any part of your car, the automotive wiring harness will deteriorate with age. Older models are most likely to be affected by a damaged wiring harness and are likely to experience this damage due to infrequent maintenance checks. However, even just regular wear and tear can harden the harness and cause areas to soften and deteriorate.


Temperature fluctuations can also lead to harness failure. When exposed to rapidly changing temperatures (e.g., extremely cold to extremely hot), the harness may bend. Wire harnesses can withstand extreme temperatures (since they are usually located near the engine). Nevertheless, it is best to avoid rapid changes from one temperature extreme to another.


Severe weather conditions are another issue. Due to extreme weather conditions, wiring harnesses can become corroded. Exposure to road salt can also increase the corrosion of the harness, which can lead to a shortened life if exposed for a long period of time.

If you want to get more information about the best wiring harness wholesale, welcome to contact us today or request a quote.   

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