You will have to do some serious wiring to get a brake controller. There should only be four wires in the back which are for the lights only. You will have to hook the brake controller into power (a circuit that is only live when the ignition is on), ground, the brake pedal switch and then run the wires to the rear of the car. Unless someone already screwed around with it, then you have to do some investigating and figure out what they did.