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HomeTips & GuidesAutomotive wiring harness assembly: 4 Important facts to consider

Automotive wiring harness assembly: 4 Important facts to consider

About Automotive wiring harness assembly, For modern vehicles with high-end features, single wires connecting the device to the electrical system won’t work anymore.

These considerations have led to the development of complex automotive wiring harness assemblies, which are a more structured, functional and convenient way of connecting the electrical components of a vehicle.

Let’s learn more about the automotive wiring harness assembly in this blog post.

What are automotive wire harnesses?

Wire harnesses are a complex collection of wires, cables and connectors bundled together to form a structured device.

 A number of industries are using these wire harnesses to transmit signals in their electrical applications, and the automotive industry is one of them.

Automotive wire harness companies are taking advantage of this opportunity and manufacturing harnesses to deliver optimal performance. 

An automotive wiring harness assembly is a cable assembly that can work for an automobile’s electrical system. 

These harnesses are designed to show compatibility with the electrical and geometric arrangements of a vehicle.

All automobiles; be it autos, utility vehicles, three-wheelers, or two-wheelers, use automotive wire harnesses. They can be found in frames, motors or in the body of the vehicles.

Employees who check the quality of the wiring

Employees who check the quality of the wiring

Benefits of automotive wiring harness:

Bringing all the wires together in a compact and single component makes these wire harnesses more advantageous than routing and connecting single wires manually.

  • Wire harnesses have a complex and tighter arrangement of wire and cables, which makes them resistant to electrical circuit shorts.
  • Consisting of long-lasting materials, they have high durability and longer life.
  • The manufacturing and installation of these harnesses ensure they withstand all types of shocks and harsh vehicle conditions while carrying power signals.
  • Low consumption of vehicle fuels is another advantage.
  • The capability of handling high currents and being resistant to heat and electromagnetic noise make these harnesses a perfect choice for hybrid vehicles.

Workers packing wiring harnesses

Workers packing wiring harnesses

Designing the automotive wiring harness:

Automotive wire harnesses come in different combinations of circuits, such as 12-circuit, 18-circuit, and 24-circuit.

 If you are dealing with a simple off-road buggy, an automotive wire harness with 12 circuits will do. 

On the contrary, for vehicles with complex and luxurious electrical systems, you may need a 24-circuit harness.

 Which automotive wiring harness you need depends on your vehicle’s compatibility.

How many circuits do I need for my car?

In any electrical system, a circuit is a group of one, two or more wires connected together for a specific purpose. 

For instance, a set of wires for the two headlights will form two circuits, while there will be a single circuit for the light, love box and starter.

 How many circuits a vehicle will have depends on its electrical components, as every electrical component will require one circuit to function.

It’s the electrical accessories that you have or wish to have in the future that determine the circuits in an automotive wiring harness. 

You must understand that the present condition of your vehicle will be okay with a 12-circuit wiring harness. 

However, if you wish to install some items later, you must pick a harness with a higher number of circuits. 

This makes it easy to make the expansion convenient and saves you from purchasing a new harness.

A 12-circuit automotive wiring harness is the most basic one, with 12-circuits indicating 12 lengths of wires for the most basic electrical accessories in a vehicle. 

Each circuit will have its designated fuse holder in the fuse block. These circuits include

  1. Wipers
  2. Turn signals
  3. Radio
  4. Gauges
  5. Tail Lights
  6. Parking lights
  7.  Hazard flasher
  8. Heat and Air Conditioner
  9. Dash lights
  10.  Horn
  11. Distributor
  12. Brake lights

Some vehicles have some more electrical accessories besides these basic ones, and thus, the number of circuits also increases. In an 18-circuit automotive wiring harness, the extra 6 circuits are for

  1. Power locks
  2. Power windows
  3. High-level stop lights
  4. Electric fan
  5. Electric fuel pump
  6. Radio B+ memory

Further, the 24-circuit wiring harness will add 6 more circuits for special accessories such as

  1. Underhood light
  2. Lighter
  3. Trunk light
  4. Glove box light
  5. Clock
  6. Dome light:

Types of automotive wiring harnesses:

The ideal wiring harness for your vehicle will depend on the electrical system complexity, the systems you need to install, and the make and model of your automobile. These include:

Universal wire harnesses:

These versatile harnesses are suitable for all electrical applications and vehicles. As they are custom-designed, they can fit any old or custom model that needs a specific harness.

 However, if you are working on the engine, chassis, or any other specific subsystem, it is good to pick a specialized harness only.

Engine wire harness:

As suggested by the name, these harnesses are specially designed to work for the engine compartment. The harness comprises wiring for spark plugs, fuel injectors and other engine parts.

Body wire harness:

This harness has wiring for all the electrical components in the vehicle’s body, such as sound system, lights, power windows, etc.

Chassis wire harness:

Designed especially for undercarriage wiring, this harness has wires for sensors, taillights and other components underneath the automobile.

HVAC wire harness:

HVAC is an abbreviated form of Heating, ventilation and Air Conditioning, and thus, the wire harness also controls systems like blower motors, AC compressors, etc.

Body wiring harnesses

Body wiring harnesses

Choose Cloom as your automobile wire harness manufacturer:

With the automotive industry’s attention diverting towards automotive wire harnesses, a lot of players have jumped into the market. 

However, not all manufacturers and their products are reliable for automobile applications.

Having more than a decade of experience and clientele spread all across the world, Cloom is one of the leading wire harness manufacturers in the world. 

With the support of our highly skilled team and high-end manufacturing set-ups, we have been delivering electromechanical cables and wires to our clients on time and at affordable prices.

Rich experience:

Automobiles are no longer like simple vehicles but are becoming more complex daily. 

Standard wiring harnesses cannot meet their functioning needs and require specialized harnesses. At Cloom.

 We design and manufacture custom harnesses of all types and sizes to meet the customers’ demands and needs for modern energy markets, including

  • Appliances
  • Boats
  • Buses
  • Agricultural equipment & implements
  • Emergency vehicles
  • Marine craft
  • Construction Equipment
  • Drones
  • ATVs
  • Military vehicles
  • Power sports
  • Semi-trucks
  • small/large engines
  • Generators
  • Lawn care equipment
  • Recreational vehicles
  • Utility vehicles
  • Tractor-trailer chassis
  • UAVs
  • Golf Carts

Cloom has been continuously in the process of innovation in designs and manufacturing for delivering products to top OEM brands across the world.


Whether it’s a simple wiring harness or a complex device wiring, we can make it all. Our expertise lies in manufacturing-

  • Sensors cables
  • Specialty wire harnesses
  • Multi-conductor assemblies
  • Primary automotive wires and cables
  • Battery cable assemblies
  • Electrical integration systems
  • EMI and RFI suppression products.

Besides, we all design automotive wiring harnesses with the most intricate features.

Whether you own a high-end luxury vehicle with special lighting, audio and video features or need wiring for long-range communications, we can design wiring harnesses for all vehicles. We ensure high quality in our products and good aesthetics too.

Our setup is huge enough to store and maintain assemblies in any quantity and, at the same time, complete new orders in low turnaround times.


With our extensive knowledge in cross-industry application of wiring harnesses and vertical integration with manufacturing, our experience has grown manifold.

 At present, we have all the resources, services, facilities and team to handle every project right from scratch.

Not only designing and manufacturing, we are efficient enough to manage product validation and evaluation, quality assurance, warranty analysis and much more with great ease and accuracy.

We remain fully updated with the growing energy consumption trend and thus work on designing harnesses to show full advantage with all newer versions of energy-efficient vehicles.


We have expertise in potting, custom overmolding and branding equipment, and thus, we can design wire harness assemblies to withstand any environmental condition, be it dirt, dust, humid, arid or desert heat.


Certified by CSA (Canadian Standards Association) and UL (Underwriters Laboratories), Cloom ensures the best quality products at the best price. 

We have many manufacturing facilities in Asia with an ISO/TS 16949-certified wire harness assembly plant in China.

 We can manufacture and deliver products at any location and in any way to meet your requirements.

Large wide cable with wires and connectors and terminals

Large wide cable with wires and connectors and terminals


With our custom designing and manufacturing capabilities in automotive wire harness assemblies, we are a stop solution for all your cable needs.

 Right from designing to delivery, our team always stays with you and takes care of even the smallest request you put forward.

Contact us to discuss your requirements with our team.

Hi I am Christa, sales manager of Cloom.

I have extensive expertise and experience in wiring harnesses and I believe I can help you.

And we have a very professional technical team who can clearly understand the customer’s needs and give professional suggestions and solutions after receiving the drawings.

If you also have wiring harness needs, please send me the drawing so that we can give you our quote and start our business.

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