Connections
 

I was replacing the battery in my old-gen blue Civic when I accidentaly [sp?] disconnected the black wire. What is the soldering point for it?

If you disconnected it from the pcb, look by the red wire (+) and you'll see a small B- next to it, that's where the neg would go. If you disconnected it by the batt, it'll go to the small tab located towards the front of the car where the batt was held in place. You can get an idea of where exactly if you check out your positive connection.

Thanks.