I have a problem with my automatic gear column. The turn indicators, the high low headlight column, the wipers stalk. Where can I buy parts so that I can fix the problem. Need diagram for 1989 gmc sierra.

The usual cause is a bad ground.
Check the ground with a test lamp.

If your wipers are controlled by the stalk on the left side of the steering column, along with the high/low beam switch, I would suspect the multifunction switch as the culprit (that's the switches contained as a unit in the base of the stalk).

sounds like you need to replace the column stalk

sounds as though it may be a column stalk issue if all these functions are on a column stalk it may have become faulty.
It the light switch for main/dip beam is discrete may be a BCM or other electrical fault.
The first is the most likely but, as column stalks may cost a lot of cash, have a competent auto electrician take a look first

this is not a normal application as with washers/wipers there are multiple operations on the stalk ( up for 1 swipe- neutral /off-down 1 intermittent speed -down again 2 intermittenent wipes --3 on all the time Twist the knob of time period of swipes during intermittent swipes.. Turn switches indicate l or r ( up or down) and back to the wheel high or low beam for the head lights or twist the knob for off parks and headlights.

Faulty switch.

Hello, The wipers are intermittent until you get to the last 2 positions,steady low and steady high. So for testing purposes you would need to turn the selector to those positions for steady power.

Here is a method for fixing the contacts on certain wiper stalks. It is a photo by photo guide for repair. I know you have a car, but these photos are good reference. Otherwise you will need to replace the entire stalk switch.

Go to FordF150.net/How to/Fix-Intermittent-Wiper-Problem-PHP

I hope my solution is very helpful towards fixing your car.

on the indicator stalk left and behind the steering wheel connected ot the steeing column if you push it away if will set the headlights to high beam if you push it towards you fully it will flash the headlamps.

the indictors to signal left and right are also on the left stalk push down for left and up for right.

the hazzard flasher is located in the middle of the dashboad above the radio and is a red triange depress once to activate and once again to deactivate.

if the wiper active at any time then try the stalk on the oposite side of the steering wheel.

Try pressing your turn signal indicator arm toward the steering column, If your wiper and/or headlight switch is stalk mounted try pressing this also they have varied by model year.

First off, do you have a knob on the dash for the headlights, or do you have a lever on the column that turns them on? If you have the lever on the column, and you can turn on the highbeams by pulling back on the turn signal stalk, and hitting the hazard button turns the flashers on, then chances are the stalk is bad (it's called the combination switch and it's a common failure on the B5 chassis cars (the Passat and Audi A4)).

Try that out - hit the hazard button and see if the hazards work. Pull back on the stalk and see if the high beams come on (they should - toggling like that uses a circuit that is separate from the usual headlight circuits).

Post back up with the results of these checks:

Headlight switch on column or dash?
Highbeams turn on when turn signal stalk is pulled back?
Hazard button activates hazard lights?

Let me know what you find out and I'll be able to tell you more definitely.