3G upgrade *visual help*

FWIW, Mustang Central has a lot of pics on their site (I'm also a picture-oriented person). Then Jrichker's alternator synopsis is as precise as it gets.

Your set-up looks good to me. On your solenoid picture, my starter cable is on the side where your cable is attached (just be sure to get the cable on the battery stud of the solenoid).

I might consider a 125 amp fuse.

And if you remove the stock charge cable, redo the sense wire (loop it to the charge cable, run a new wire or dig the old one out and reattach it).

That's all I can think of.

Good luck.

and as for the spliced wires, Use anything that only has power when the ignition switch is in the Run position. Be sure to use a low current fuse (1-3 amp) in the lt green/red wire. Under the hood of a EFI 5.0 Mustang, the ignition coil red/lt/green wire or any solid color red wire is a good choice.

The I terminal wire should have a 500 ohm Resistor in it. Even the retrofit harnesses have this resistor in them.