Radio wiring for 1994 Gmc Sierra

Does anyone know where to get free wiring schematics just for the radio hookup im installing different sound system .much help would be appreciated ..
thankyou, john
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You might try Crutchfield.Com. Although no diagrams you can get a connector prewired to plug directly into the factory plug. The adaptor with come color coded according to your vehicle and with a basic diagram of what color is for what.
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www.bough4less.com in their Help/ How to section
Also, Just buy a Radio Harness adadpter Metra # 99-1858
it makes everything a plug in NEVER CUT WIRES,,,, NEVER CUT OFF FACTORY PLUGS
: Does anyone know where to get free wiring schematics just for the radio : hookup im installing different sound system .much help would be appreciated : .. : thankyou, : john : :
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