Many Components Make Up The Wiring Harness

- Jan 16, 2019-

What Is A Wiring Harness?

A wiring harness is an organized set of wires, terminals and connectors that run throughout the entire vehicle and relay information and electric power, thereby playing a critical role in “connecting” a variety of components. Power and information travel through this network much like the circulatory and central nervous systems of the human body.

As cars continue to provide advanced functions, their component parts increasingly require electronics to save space and meet other requirements. Experts at the efficient design and configuring complex circuits, SEWS creates wiring harnesses that contribute tremendously to the development and advancement of car manufacturers around the world.

Wiring Harness Components

A close look at a typical wiring harness will reveal a network of electric wires, connectors, terminals, clamps, tape, convoluted tubes, and sheaths.

Electric Wire for Automobiles

Wiring harnesses consist of various wires bundled together, with each individual wire responsible for carrying the electric signals and energy used in starting the engine, lights, meters, navigation systems, power windows and doors, and other devices in the vehicle.

There are many different types of wire used in a wiring harness. Some varieties are more flexible, more heat resistant or more cold resistant, and others can be smaller for easier routing or larger for products requiring more current.


In their role of connecting wires and cables within an automobile, connectors must function in environments with extreme temperature variations, vibrations, water, electromagnetic interference, and other conditions. With the increased use of information technology, we have developed a variety of connectors and other components that connect wires to GPS, TV, and other wave receiving devices in today’s automobiles.


Terminals are the current-carrying connection points between the wires and the features in the automobile. Made of a variety of metals, these parts can be coated differently to meet a number of conditions.