| Repair Guides | Wiring Diagrams | Wiring Diagrams The following wiring diagrams are provided to help troubleshoot electrical problems and as a an additional source to help understand the complex wiring utilized by these vehicles. No attempt has been made to illustrate most components as they physically appear, instead, representations are used to simplify the diagram. 1986 ford f150 wiring harness | eBay Find great deals on eBay for 1986 ford f150 wiring harness. Shop with confidence. Skip to main content. eBay Logo: 1980-86 Ford F-Series Pickup F150 Modern Update Complete 12v Wiring Harness XLT (Fits: 1986 Ford F-150) Brand New. $245. Buy It Now. Free Shipping. 1.0 out of 5 stars.