Wire Harness Design and Manufacturing Techniques and Tips Jun 15, 2016Since these products are incredibly important, it’s a good idea to understand Wire Harness Design and Manufacturing techniques, from the conception to the final product. Here’s how a wire harness goes from an idea to an actual product in a home/business. Wire Harness Design Wiring and Cabling: How To Lace Cable Harnesses Harnesses are usually fabricated on a harness jig or forming board. The board may be marked with numbers and symbols to indicate wire sizes, color coding, routing, terminations, and wiring sequence. Pegs or nails, placed in a pattern which follows a pictorial wiring diagram, serve to locate wire runs.