My reverse lights won't light up when the car is in reverse.

I'm not sure where the backdrive is, I am told it is located on the
steering column somewhere.There are 3 switches that I can see from
under the steering column under the drivers side of the dash: one near
the clutch, one over the brake, and one on the top of the steering
column near the firewall.

They all have 2 plugs sticking out and wiring harnesses attached to
these plugs. I'm not sure if the plugs that are plugged in are the
right ones, because previous owner screwed around quite a bit under
the dash. What color wires are supposed to be connected to each
switch?
    I think this may be the problem, because when I hit the brake,
the instrument cluster lights will turn on, along with the running
lights in the front and back, as if I had switched them on by the
headlight knob.

Any help with this would be greatly appreciated, Spring is here and
I'm itchin to register this thing...