Battery draining fast

What about that third green wire . I previously missed it last night working with a flash light . first green at the top and second green on the side with the blue wire connected to the bottom .Funny thing is that the wire that is now connected is ran outside of the harness alone like the previous owner added it later If you look closely at the regulator photo you can see all three wires going to the regulator and in the pic of alternator that 3rd wire is cutoff at the alternator . Maybe I should use the original wire and I'm guessing the clip on the side is to ground the regulator and not to the field connection.
Thanks for the replies gentleman.