What Is a Wiring Harness?

Wiring Harness

What Is a Wiring Harness?

Wiring harnesses are a key part of many electrical assemblies. They are commonly used in commercial vehicle manufacturing, agricultural equipment, construction machinery and other industries that require complex wiring.

Although manufacturers have a desire to automate their wire harness assembly processes, it remains difficult for them to do so. Manual production still remains more cost-effective, especially with small batch sizes.

Electrical Requirements

Wire harnesses are used to organize and protect multiple wires within a large system. This reduces labor costs and potential for error, and allows technicians to fit complex wiring assemblies into small spaces. They are commonly utilized in aircraft, automobiles, computers and other information technology equipment, medical devices, telecommunications systems, and commercial buildings.

The electrical requirements of a Wire Harness can vary from application to application. However, some common factors that must be considered include space and weight. These considerations help ensure that the final product will be effective and function properly.

Cables and wires within a Wire Harness should be insulated to provide protection against extreme temperatures, moisture and other detrimental elements. Insulation also separates the individual wires to keep them from interfering with each other.

A wire harness is designed to meet the specific needs of the application and must be built to precise specifications in order to function properly. This means that it must be accurately sized, assembled with proper threads and inserted into the desired locations without any interference.

Depending on the application, the wire harness may need to be able to accommodate a variety of wire sizes and gauges. This is why it’s important to consult with a professional who can help you determine the correct size and thickness of the wiring within the harness.

All cables and wires in a Wire Harness must be rated to conduct the appropriate amount of power, signal or data. This is done by determining the appropriate circuit breaker wattage, as well as the maximum voltage that can be applied to each wire.

If the harness contains a stranded wire, it must be sized according to its AWG (American Wire Gauge) or SWG (Standard Wire Gauge). These standards are determined by the physical size of each wire.

Cables that connect to a harness must also be properly sized and placed to allow for stress relief. This is especially important when connecting to a connector backshell, as this can cause strain on the harness.

Cables and wires in a Wire Harness should be tightly wrapped with lacing or tie wraps to maintain them in a tight, neat bundle. This is to prevent the formation of splices or solder sleeve damage.


A Wiring Harness is a bundle of wires Wiring Harness and cables that are organized to efficiently transmit electrical power and signals. These harnesses help technicians fit complex wiring assemblies into small spaces and eliminate the potential for human error.

In a vehicle, wiring harnesses are used to connect the many electronic control modules that control everything from engine ignition and fuel injection to HVAC controls and infotainment system settings. As a result, they must be carefully designed to ensure that all connections are properly sized and positioned within the space.

These harnesses are fabricated from a wide array of materials to meet the needs and specifications of the client. They also have to be able to handle the various external forces that may affect them, including temperature and humidity.

The design process begins with the creation of a 3D model of the harness. This is done in a computer-aided drafting program like CATIA. The 3D model is then flattened back into a 2D drawing to be used in the manufacturing process.

During the flattening stage, the designer must consider the placement of each individual wire in each bundle as well as its termination location within the connectors. Depending on the specific requirements of the project, retaining clips, grommets, cable ties and abrasion protection sleeves may be added as well.

Once the wires and cables are all bundled up into a single harness, they need to be tested for point-to-point electrical continuity. If the harness does not have the proper amount of insulation or if the connections are too short, there is a risk that it will not conduct electricity as intended.

Additionally, the testing phase can reveal if there are any electrical shorts or ground faults. If these issues are discovered, the technician will need to re-route and re-connect the wires.

This can take time and be difficult to complete manually on your own. Wiring Harness In most cases, the best option is to hire a skilled professional that can take care of the task for you. This way, you can focus on the important things and avoid costly mistakes that could cost your business more money in the long run.


A Wiring Harness is a collection of wires and terminals that connects electronic devices, allowing them to communicate with each other. It’s used in a wide range of industries, including aerospace, automobiles, medical equipment and telecommunications.

Depending on the application, harnesses may use different materials and features. They can also be designed to accommodate specific conditions, such as abrasion or high temperatures.

Insulation is a critical part of any harness. Without it, connections between the various wires could be damaged. The type of insulation a harness uses depends on the environment it will be placed in, and the layout of the wiring inside it.

Braiding is another way to protect your harness. It reduces chaffing, which occurs when the wire or connector is exposed to vibration or moisture. It can also prevent heat-transfer, which could damage other components in the harness.

Terminations are the final pieces of a wire harness. They come in a variety of forms and can include ring, tongue, spade and hook terminals. They’re commonly found in industrial and automotive applications and can be insulated or non-insulated.

Bullet terminals are a common type of terminal for a harness because they’re easy to attach and remove, and provide a stable connection between two wires. They’re also available in a variety of sizes to accommodate the different wires within the harness.

Cable assemblies are another important component of a wire harness. They are typically used in environments where electric service reliability is of utmost importance. For example, airplanes, drones and satellites all have masses of wires that would be difficult to handle if not bound together with a cable harness.

Finally, the last type of material that’s often used in a wire harness is insulation. This is because it helps to keep the electrical signals in the wire harness safe and prevents them from shorting out due to contact with other wires.

There are five types of insulation that are most commonly used for wiring harness manufacturing. These include PTFE, polyethylene, PVC, nitrile and rubber. Each has different technical specifications, but they all have one thing in common: they help to protect the electrical wiring in your harness from abrasion and damage.


A Wiring Harness is a complex assembly that can be used in harsh work environments. This makes it essential to find a manufacturer who has the experience and capabilities needed to create an effective wiring harness for your application.

The Wiring Harness Manufacturing industry has a number of certifications that manufacturers should hold to ensure that they are producing quality products and meeting customer specifications. The most important is IPC/WHMA-A-620, which sets a standard for the quality of wire and cable harnesses.

IPC/WHMA-A-620 – Requirements and Acceptance for Cable and Wire Harness Assemblies is an industry standard created by the Association Connecting Electronics Industries (IPC) and the Wiring Harness Manufacturers Association (WHMA). It covers the requirements of the fabrication, installation, and inspection of crimped, soldered, and mechanically secured interconnections.

It also covers the assembly of the cable assemblies, testing procedures, end housing and bundling. This training is designed to be a guide for new employees who are starting a career in the field of harness manufacturing.

This training will teach students about the types of materials that are used to assemble wire and cable harnesses. It also provides information about how to use the tools that are used in the process and what steps should be taken to make sure that they are properly handled and cleaned.

The course is structured in accordance to the IPC/WHMA-A-620 standard and is a hands-on lab style class. The course can be customized to suit the specific needs of a company. The course is taught using industry-standard tools including wire cutters, strippers, soldering irons and test equipment.

An IPC/WHMA-A-620 Endorsement is available for quality assurance managers, assembly process engineers and others who are responsible for the production of wire and cable harnesses. This endorsement is recognized by many OEMs as a sign of a manufacturer’s commitment to providing a quality product.

The IPC/WHMA-A-620 is the most respected and accepted quality standard in the industry today. It promotes standardized operations and helps wire and cable harness manufacturers excel in terms of quality, productivity and customer satisfaction. It is also a tool for facilitating cross-channel communication between original equipment manufacturers and wire and cable harness manufacturers.

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