Chevy Color Code for Dummies | The H.A.M.B. Sep 11, 2015This is a list of the Chevy Color code as recognized by most wiring companies. This is by no means absolutely complete as Chevy changed things here and there as well as had different color codes for options such as Power Windows or Air Conditioning. This is meant as a helpful guide to wiring your car with the basics.The H.A.M.B.Mar 03, 2019The Hokey Ass Message Board | The H.A.M.B.Mar 03, 2019Technical - 1955 Chevy 3100 Paint Code 723? | The H.A.M.B.Mar 20, 2014Chevy Engine Orange...t Code?? | The H.A.M.B.Dec 03, 2008See more results LS SWAPS: Wiring Harness and Wiring Guide Mar 10, 2015Red is the smallest, fitting 22- to 18-gauge wire; blue is for 16- to 14-gauge wire, and yellow is for 12- to 10-gauge wire. Anything bigger is sold by the size, not color. Primary wire is typically an 18-gauge wire and is the most common wire found in wiring harnesses.