1999 Chevrolet Silverado Tail/ license/brake lights

1999 OBS Silverado, I have no tail or any brake lights. At one time there was a 7 pin on the truck because from the front of the truck I have a large blue and large red/orange wire. In addition to those I also have the normal wires for a 4 pin and the light green for reverse. In the back of the truck I have the normal 3 wires for turn/brake and tail lights. Now, coming from the front I also have a small blue wire that I have no clue where it goes and in the back I have a large black and even larger white wire. What am I hooking up in order to get my tail lights and brake lights to work? I have turn signals and reverse lights but that's it! No tail/brake/license plate lights.