Classic Update Kit - 1973-79 Ford Truck & 1978-79 Ford If the 510342 Classic Update Kit is being purchased for a 1973-79 Ford Truck with dual fuel tanks, the Dual Fuel Tank Harness 510359 add-on harness must be purchased to complete the installation. Classic Update Kits give you one of the most complete kits on the market to “Make Wiring THAT Easy”. ford f100 wiring harness | eBay Find great deals on eBay for ford f100 wiring harness. Shop with confidence. Skip to main content. eBay Logo: American Auto Wire 1961-1966 Ford F-100 Truck Wiring Harness # 510260 See more like this. 73-79 Ford F150 f250 Cargo Bed Light with Switch Wiring Harness f 150 250 100. Pre-Owned.