Exact OEM Reproduction Wiring Harnesses for Classic Our wiring harnesses are brand-new and better than N.O.S. (new old stock) THE PROBLEM: Let's face it folks, NO automobile manufacturer ever designed a wiring harness to last 30-60 years. As a matter of fact, your vehicle's original wiring was only designed to last 10 years before it started to deteriorate! There is ample documentation to substantiate this claim.[PDF] harnesses-unlimited Harnesses Unlimited P.O. Box 435 harnesses-unlimited Harnesses Unlimited P.O. Box 435 Wayne, PA 19087 PONTIAC HARNESS SYSTEMS (continued) Note -From 1939 to 1954 we do not have the rear wiring harnesses for most models. We have included with each front set a kit of wire and terminals so you can wire the rear electrical components.