Picture 2 (following the harness)
1 Fuse Box Connector
2 Fuse Box (GT500 not used)
3 Large Black Conncetor with Red insert Connector (GT500 not used except you would have to splice one wire off of it into the smaller grey connector next to fuse box on the regular GT harness)
4 Large Grey connector above lug is for the Radiator fan

Picture 4 (obviously you have your fogs and headlights plugged in)
1 Brown and black connector next to each other are your turn signal and parking markers.

2 Black plug on wire harness is the horn.

3 Mystery grey plug wires back into the plug GT500 LARGE black and red connector up by the fuse box. I have been going over my GT harness and I couldn't at this point in time track this one down.