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Are you referring to the trucks wiring harness? I hope you purchased an integration harness. Your truck has a databus system and an integration harness is needed to maintain certain functions including door chimes, warning chimes, on star (if equupped) etc.
also the factory radio does not have a switched power lead to turn the radio power on with the key. That is also handled via databus.
OK, if you are trying to put an aftermarket DEH-1200 MP radio into your car, they sell the radio adapter wires and plugs that will actually tell you what leads to connect to or speakers, power, and antenna actuator, etc.
You don't need a schematic to use this product, it comes with color coded wires with labels on them to tell guide you into a proper installation.
Try Best Buy for a wide selection of these adapters and wiring harnesses specifically made for aftermarket radios.
If they don't have it, they can order it.
You may, alternatively, try Ebay.com where they may have the product you are looking for.
anytime you are installing aftermarket stereo in car you should purchase wiring harness converter which comes with schematic, but if you insist on doing it old school youll need a repair manual to show color codes on wiring or a 12 light meter but lucky for you I looked up the wiring codes online heres link: http://www.the12volt.com/installbay/stereodetail/1690.html