SmoothLex

Hey all... Could somebody help me please!! I took out my stock sterio system from my car and replaced it with a kenwood headunit. My query was inregards to a circuit diagram or colour code diagram for my sterio just so i understand what is what... Secondly would anyone know if the standard amp could be used for other headunits and if so would that come back to understanding the colour codes of the car? Cheers.