Basic Steps for Wire Harness Building – Part I Create a Wiring Diagram: Before any of the wire cutting can begin,..Collect Your Tools: The next aspect is to collect all the necessary tools to get the job done.Strip the Wire: Use the wire stripper to remove a small part of the insulation from one end..Cut the Heat Shrink: Cut the heat shrink tubing.. Basic Steps for Wire Harness Building – Part I Is this answer helpful?Thanks!Give more feedbackThanks!How can it be improved?How can the answer be improved?Tell us how How to Build a Wiring Harness - Muscle Car DIY Jun 27, 2015Prepping a Harness. Again, this is a case where your new accessory came with a wiring harness of some kind. Take a moment to inspect it to be sure that it is truly ready to install, rather than get in the vehicle and start wiring it up only to find out that: Some or all of the wires are not long enough. Wiring Harnesses - Factory Fit We Make Wiring THAT Easy! 150 Heller Pl, Bellmawr, NJ 08031 | Call: 800-482-9473 Mon-Fri 8am-5pm EST Prices subject to change at any time. Factory Fit logo is a registered trademark.