Go to www.the12volt.com they will have your wire diagram for free.
Autozone's website.
In a service manual at a dealer, parts store, or library.
http://www.the12volt.com/installbay/stereodetail/100.html
http://www.modifiedlife.com/2000-ford-explorer-car-radio-stereo-wiring-diagram/ factory wiring color codes
Wiring diagram of what component?
consult a service manual wiring diagram information page.
wiring diagram for GMC 2500?
You can get a wiring diagram for a 2000 Buick LeSabre at any auto parts store. A Buick dealership may also be able to give you a wiring diagram for free.
It is the same as my '01 Focus. The schematic is here: http://www.modifiedlife.com/2001-ford-focus-car-stereo-wiring-diagram/ Basically it will tell you what color wire does what
The spark plug wiring diagram for a 2000 F-150 can be found in its service manual. The service manual is available from Ford.
2000 honda foreman 450s charging wiring diagram and charging system flow chart