I am a new user of the Chilton DIY manuals. The access to wiring schematics is great, but I don't understand all the references and can't find a reference key. For example, C200 references a connector, but what does S213 reference? Also, wires are have labels like 3RED 242. I understand it is a red wire but don't know what the numbers refer to. I anyone can help me it would be very much appreciated.