The12volt

[tast101]

http://www.the12volt.com/

Not sure if any of you know about this website. But it can be very helpful. With stereo installs, wiring subwoofers, building sub boxes. Lots of http://www.the12volt.com/caraudio/boxcalcs.asp

They have application guides and wiring diagrams for alot of vehicles. http://www.the12volt.com/installbay/appguide/2003/GMC/Yukon.html

Here's some electrical info.

 

[Mr45]

Looks like a great resource, thanks for posting!!