Wiring Harnesses - VW Parts Main Wiring Harness, 1973-73 1/2 VW Super Beetle Sedan and Sunroof, WM-131-1973 is made from original wiring loom schematics and is factory color coded. This is the MAIN HARNESS that runs from the fusebox in the front, to the engine and tail lights in the rear. This is ideal for doing engine wiring, or to repair engine fire damage. 1973 vw bug wiring harness | eBay Save 1973 vw bug wiring harness to get e-mail alerts and updates on your eBay Feed. + Items in search results. 1972-1973 VW Beetle Sedan Complete Wiring Harness 344509. Brand New. $355. Buy It Now. Free Shipping. VW Fuse Box to fit 1973-79 Super Bug/VW Bus 1973-79-#135 937 505-Good Used. Pre-Owned.