1973 Ford Bronco OE Wiring Harnesses & Stereo Adapters Ford Bronco 1973, Factory Replacement Wiring Harness by Scosche®, with OEM Radio Plug, Power/Speaker. Up yourself and your tunes over the factory installation with top-of-the-line audio products from Scosche. bronco wiring harness | eBay 1973-1979 Ford Truck 78 79 Bronco Dash Wiring Harness Bracket Black Or White. Pre-Owned. $19. or Best Offer 1977 Ford Bronco Wiring Harness 510317 IN STOCK See more like this. NOS OEM Ford 1989 Bronco II 2 Wiring Harness Under Dash See more like this.