[PDF] WHAT YOU NEED TO KNOW TO DESIGN A WIRE HARNESS WHAT YOU NEED TO KNOW TO DESIGN A WIRE HARNESS and production time. Track All Changes If harness design occurs early in the overall design process, ensure that all changes to wiring during design finalization and throughout the build process are identified, tracked, and resolved through the harness design. Update the bill of materials. The Wire Harness Manufacturing Process: Step by Step Jun 29, 2018Wire harness manufacturing is a process. Design and assembly from the drawing board to finished wire harness requires step by step planning and a good amount of manual production. Each wire harness has a specific purpose to integrate into a larger electronic network, which, in the modern world, truly does make wire harnesses indispensable.