[getkey]

Hi guys!
Sorry for my bad english!
I hope you can help me. I'm installing an EMG Zakk Wylde set in my Epiphone Les Paul Standard, but I have a problem.
Here's a picture I made with paint. It only shows the pots and the wire from the pickup selector.
So, 3 wires coming from the pickup selector (yellow - neck pu, white - to input jack, red - bridge pu). But when they reach the pot cavity there is one more wire (a black one). I don't know, where it's coming from. And there is some kind of plug here (the brown thing on the picture). On the other side of the plug the wires have different colours. And the black wire is divided into two, and joins the white wire and one of the red wire (i have 3 wires again). Does anyone know where should i solder the wires (in the yellow circle)?
Please help me, if You can!
Thanks in advance!