I have a 2009 mercury milan Premier with 8 speakers and a factory amp. I have replaced the stock HU with an aftermarket one Pioneer AVH4100NEX, i have also replaced the two rear deck 6x9 speakers with pioneer ones. I've added a Pioneer amp and Sub, everything works great however, i no longer have control of the factory amp so i am installing another one, nothing big, just something to control the 6x9's in the deck. I want to retain the factory wire harness that goes to that amp but don't know what wire does what. Anything i see on the internet as far as wire diagrams go does not include the diagram going to the factory amp. I know which plug is for the speaker out put and which is the power, and i have a vague idea which wire is the accessory wire for the factory amp. Anyone have any ideas where i can get the correct diagram from? Or if you have one atleast let me know which wire is which before i blow something other than a fuse.