Repair Guides - AutoZone AutoZone Repair Guide for your Chassis Electrical Wiring Diagrams Wiring Diagrams WIRING DIAGRAMS - 73-87ChevyTrucks. Classic Chevy PDF fileWIRING DIAGRAMS DESCRIPTION These diagrams use a new format. The diagram is surrounded by a alpha/numeric loaction grid. All the wires at the connectors have alpha/numeric addresses showing where the other end of the wire is located ac cording to the grid. The Complete 73-87 Wiring Diagrams Here are the complete wiring harness schematics for the 73-87 series pickups. These are HUGE jpgs so you may want to save them to your hard drive and print the pages you need. 73-76 diagrams 73-76 cab Interior 73-76 chassis rear Lighting (chassis/cab and Stepside 73-76 chassis rear Lighting (Fleetside and Suburban 73-76 engine and Front Lighting 1980 Chevy Truck Wiring Diagram - Circuit Diagram Maker 1980 Chevy Truck Wiring Diagram - Welcome, thank you for visiting this simple website, we are trying to improve this website, the website is in the development stage, support from you in any form really helps us, we really appreciate that.