What is in the steering column?

[ABX131]

So we switched over the steering colunms and I carefully matched up all the wires from the column to their counterparts under the dash in the harness. I did one wire at a time keeping all the colors consistent. Upon completion I have lost my brake lights. The white wire from the column is this connection. I have power from my brake switch wire to the white wire when the pedal is pressed and the power is moving into the column and does not go beyond to the lights as it did before. What is in the column that is possibly broken that is not allowing the power to flow out to the lights? Is it the turn signal switch that controls all this? All my signals and hazzard lights work. The wiring diagrams I have seen dont show what is in the column, they just end at the plug to the column.