Audio Systems: Adding amp to 2001 Tacoma, input plug, pin plug

Question
Hi, I have a 2001 Tacoma with a CD/Cassette head unit (model 86120-AD020) I would like to install an amp and keep the original head unit.  There are three plug ins, 6 pin, 10 pin, and 12 pin.  Is the 12 pin an input plug, or output plug.  How do I obtain a source for my amp?  Thanks,  Eric

Answer
all the cables that you need are on the 10 pin plug
1987 to 2007 are the same plugs
http://www.installdr.com/Harnesses/Toyota-Wiring.pdf

also the other big plug is for aux input or ipod interface http://www.oemautosound.com/c-113-toyota-to-ipod.aspx