Where does this brown wire plug in?

[sKnNyPpY]

Hi guys, I have all new battery, alternator, regulator, positive and negative terminals and wires to alternator bracket and starter respectively, and a new HEI. I'm not getting a charge from my alt and drain the battery after jumping and running any electrical such as wipers/ a/c. After tracing all the wiring all I can find is this brown wire and connector unplugged (to regulator?) and a green wire that has some kind of insulation around it cut off riding along with the old yellow and purple from the starter. Thanks, she's almost there!