WyoBowhunter21

First post here. I poked around on the site for a while and have had no luck so I figured I would sign up and ask my question. I see it has been asked a lot but I still need some assistance. I bought an ARE topper used for my truck last week and I am trying to wire up the third brake light. I found the X63 using the GMupfitters bulletins but my issue arises when I am trying to connect where the #1 wire is. There is a red in #1 and a black wire in #7. Can someone help me out here? Sent from my iPad using Tapatalk