cherroneballs

hi I know this is pry gonna get flamed but hopefully someone can help me out, my little brother took the alternator out of his 86 nissan 200sx, and I put a new one in it for him 2 weeks later and theres a 2 prong plug that plugs into it, and a thick, white wire that goes on the battery terminal on the alternator, theres also a thick black wire with a ring terminal coming off the same part of the harness that he don't know where it went. Does it go with the white wire or somewhere else????