A diagram of the 1971 Chevy Nova steering column would include the ignition and the shifter information along with the steering column itself. This type of diagram is often found in the Chilton's manual for the year and model.
Underneath dash just to the right of steering column.
One of the links in the search below should help.
I need a wiring diagram for the battery, starter, and solenoid of a 1971 Chevy truck, 350.
Check the steering column. There is a switch mounted to the column that controls the backup lights and the neutral safety switch.
underneath the steering column. it will have leads running from it to the firewall as well as to the shifter
you can find this in the 1971 chevy2/nova factory assembly instruction manual
What engine? V8? 18436572 for chevy 1991 silverado v8 350 diagram
The switch is located on the steering column right before it exits the cab.
neutral safety switch on top of steering column under dash.
You can find the diagram in a 1976 Motor Guide. You should be able to pick one up on eBay for about 15 bucks.
The ignition switch is located on the steering column just above the brake pedal. it has 2 screws holding it in place. You will need to take the entire steering colum off. Pull the wiring harness out.. it's a real pain. I own a 1970 SS 396 cowl induction, factory air, everything stock. It's an orignal. == == Your car has a Rack and rod setup. When the key is turned it pushes the rod down the steering column and slides the ignition switch into the position you want. To replace it you need to remove it from the bottom of the steering column. There should be either two screws or a clamp.
get a chiltons repair manual from the library or autozone sells a small version in paperback that should show you.