Log into AllData, then click on Diagrams (left side with light blue background). After clicking that, there's a link called Connector Views. This is mostly what I used. The C1 - C5 series connectors (i think) are what I used most. These will have each pinout with a description of the circuit and function (feed & output). As Allen has told me, it's tedious. I'll say again... IT'S TEDIOUS! If you're going to go this route, you may want to look into the stock underhood fuse block, as the relays and such are recommended. I have the extra space, and incorporated the use of that fuseblock in my setup. Allen's harnesses look quite a bit more stealth. Good luck!