This BROTHERS Tech Tips video is part 2 on how to install a wiring harness on your 67-72 Chevrolet / GMC pickup truck. Learn how to install a wiring harness with this step by step tutorial. If you need assistance finding or installing parts for your Chevy/GMC pickup, call BROTHERS at (800) 977-2767. Check out our website, where we have convenient kits available. Here is a list of complete wiring sets for you classic Chevy truck.