One of the challenges DIY installers face is finding the correct installation diagrams for car stereos. Below I have put together some of the best free sources for car stereo wiring diagrams and wiring colors. The first resource is best for finding the power wires for your car. The second two deal more with wiring diagrams for car radio.
the12Volt Wiring Diagrams - This site is provided by the12volt.com and is extensive. It covers most makes of vehicle and has both stereo wiring diagrams and car alarm wiring diagrams. The diagrams are provided on request by members of their forum that have access to car alarm manufacturers wiring databases. They are then cataloged and indexed on the site. Very helpful and you can request other diagrams in the forum if yours is not already available.
Wiring Diagrams - This site is provided by Bulldog Security and is geared toward car alarm installation. Still good for finding the power wires needed to hook up your car stereo. This is the go to site for free car alarm wiring diagrams.
Installation Diagrams for Car Stereos - This site is provided by Autotoys. The pages are not model specific but do concentrate on the wiring diagrams for car radio. The site is sparse compared to the other two but the diagrams they do have are good.
The Car Audio Help DVD catalog includes five different videos covering many areas of car audio installation and custom fabrication. Topics range from basic system installation (head units, amplifiers, speakers, etc.) and mobile security (car alarms and remote start) to subwoofer box design and fiberglass fabrication. If you're interested in custom fabrication and car audio installation be sure to check out what we have to offer.