Answer
There are not
any dedicated web-sites withthat definition. thre are web-sites that show you principles such as -
http://www.the12volt.com/ohm/ohmslaw.asp
http://www.howstuffworks.com/
http://autorepair.about.com/
http://autorepair.about.com/od/troubleshooting/
..and you can go here-----_
http://www.eautorepair.net/
..and for an annual subscription, you can have all the published data for the car right at your computer.
nice
luck