steering wheel misalignment broke shaft for horn contact

[rocky_mtn_man]

1991 GMS Sububan V2500 FWD. I had replaced my ignition switch after it seized up, and was unable to install the retainer clip. A lousy moving company was borrowing my tow rig and I let the owner drive my suburban and haulmark trailer. The nut had come loose, and he installed the steering wheel in the wrong position.

I finally pulled the steering wheel to center it and discovered due to the misaligned position, the plastic shaft for the horn button flexible contact was broken because it bumped up against the base of the steering wheel, instead of being aligned with the large hole. As a consequence the horn won't work.

The question is whether this shaft is part of the turn signal mechanism, in which case I need to order a new or used one, or to go to a junk yard and get a rGM replacement. The steering column is common to many GM vehicles, so a Buick of similar vintage would suffice.

[ChevyTech]

It sounds like you need the Turn Signal Canceling Cam. It is not part of the turn signal switch.

Here is a thread that has some photos that may be helpful when you are trying to get to it:
http://67-72chevytrucks.com/vboard/s...ht=tilt+column

Below is a photo of the turn signal canceling cam.

[rocky_mtn_man]

I bought a new cancelling cam and aligned it with the big hole in the steering wheel. You have to use a lock spring depressor tool to remove the spring clip. After struggling with the removal of the clip, I came up with a method that is easy to use.

Align the gap in the ring so it's just before the gap. I used a small Whia screwdriver to pry up in the cavity of the threads, one it was up, I used another small screwdriver to push it off the groove. I had to do this a couple of times before I got the alignment for the steering wheel correct.

Next challenge was getting the horn spring loaded wire to engage in the slot of the cancelling cam. It took patience, but I eventually got it to engage and not pop out.

I thought the horn button wasn't working, but after pulling it off a second time and reinserting everything is working fine now. Phew!

From the wiring diagram manual: (sorry, I can't get the image to not be rotated 90 degrees)

"When the horn switch is depressed, one side of the Horn Relay is grounded. The relay is energized. The relay contacts close and battery voltage is applied to the horn(s).