1972 k10 reverse wiring HELP

[DJ_]

So I got a problem with my reverse lights. So I just got my truck going about a month ago and I notice my reverse lights never work so i check them and it turns out there was no bulbs the previous owner wiring is all jack up so I fixing it little by little but when i put bulbs in it still doesn't work. An a week ago I was driving and I notice the reverse lights where on but they are on when I'm in over-drive lol and I believe My steering column is a CPP tilt and I can't figure out off to take it apart I can take the steering wheel off put to take off the top part of the column I can't. Does any one have a diagram of CPP column. Sorry if I sound like a newbie Im just getting into this.