1979 ford f150 wiring harness | eBay Find great deals on eBay for 1979 ford f150 wiring harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. 1973 - 1979 Ford Truck ignition Wiring Harness Duraspark F100 F150 F250 F350 . Pre-Owned. $35. Guaranteed by Fri, May. 10. Buy It Now +$7 shipping. Best Wiring Harness for 1979 F250?? - Ford Truck Sep 21, 20081973 - 1979 F-100 & Larger F-Series Trucks - Best Wiring Harness for 1979 F250?? - I need to deal with the mess under my dash, but after surfing the 'net for hours I am overwhelmed by the number of aftermarket wiring harnesses available. Anyone have any suggestions as to which harness would be the best (and easiest)?..