Complete 73-87 Wiring Diagrams News: As of April 1, 2008 All Classified forums require a Site Supporter subscription. It is only $25 per year and you can buy and sell whatever you like on the forum. Here are the complete wiring harness schematics for the 73-87 series. These are HUGE jpgs so you may want to save and print them off. 73-76 diagrams 73-76 cab Interior 1986 Chevy S-10 Pickup Wiring & Lights | Gauge Wires Chevy S-10 Pickup 1986, Wiring Harness Complete with LED Kit by Classic Dash®. This Harness will wire into your factory harness and allow you to plug it into the Gauges. If you're looking for a quality product that will serve you for..