In-Depth Guide to Automobile Wire Harnesses | Wunsch The assembly process is the critical step in the manufacture and assembly of an automotive wiring harness- During this process, all components of the parts are assembled to complete the assembly. Several manufacturing techniques can be used to perform this process. Defining Wire Harness - Wunsch Technologies Automotive Wiring Harness. Automotive wiring parts have made the use of electrical components in automobiles a breeze today. And the technology has reached amazing strides in the last few years. In fact, the wiring in automobiles industry has become a lucrative industry in itself.