2008 GMC Sierra 1500 Car Stereo Wiring Schematic Whether your an expert GMC Sierra 1500 mobile electronics installer, GMC Sierra 1500 fanatic, or a novice GMC Sierra 1500 enthusiast with a 2008 GMC Sierra 1500, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 2008 GMC Sierra 1500 vehicles are becoming increasing more difficult to identify Read More Read More Free GMC Wiring Diagrams - YouTube Click to view on Bing0:32Totally Free GMC Wiring Diagrams! Idiots Tree Felling Fails with Chainsaw Machine - Tree Falls on Head and House - Duration: 8:11. Woodart Presents Recommended for youAuthor: imallwiredupallViews: 37K SilveradoSierra • Free online wiring diagrams Chevy Truck Forum | Silverado Sierra GMC Truck Forums. Free online wiring diagrams. Jan 04 2016, 5:22am. Can be limited on some stuff, Does anyone have a wiring schematic with ecm pinout to share for 92 siverado with 7.4 auto 4x4 k3500 using ecm #1614060 axrd the 1227730 is everywhere but I cannot find the 1614060 for my truck, 2008 GMC Sierra Trailer Wiring | etrailer Call 800-298-8924 to get Expert Service ordering a Trailer Wiring for your 2008 GMC Sierra. Complete installation instructions and lifetime technical support on all Trailer Wiring purchases. Lowest price guarantee on accessories for your GMC Sierra and the fastest shipping available.