Horn honks when hooking up to battery

[MY1978]

So, I apparently need high caliber brains to fix this.  I went to put the steering wheel back on, after trying to clock it, and I noticed that the steering wheel was on upside down, but because the wheels were turned slightly out.  So I started the truck, straightened them all without incident except then the horn would not blow.  So I pulled the steering wheel off, removed the locking plate and made sure the cancelling cam was seated correctly.  Put everything back together and when I went to hook the battery back up, the horn blew.  So AGAIN broke it down to the cancelling cam, AGAIN the horn blew.  So I decided to try just putting the cancelling cam and locking plate back in place - and the horn blows.  WTH!!!  it wasn't doing that when I started it to straighten the wheels.  Any thoughts or ideas.  Prior to this the horn was fine.  I was watching some videos and I will check the horn spring and fuse today.  I also have all the parts ready to order in my cart from where I have ordered parts from.

1978 Chevrolet, C10, 350,

[bd]

Either the horn relay control circuit is grounded, or the relay is faulty.  Does the horn blow with the lock plate and the cancelling cam removed?

[MY1978]

Was late yesterday when I threw my hands up and said I am done.  I am going to try that today.  I have some other things to do around the yard, then will go back to that.

Thanks

[bd]

The resolution should be simple, and may be obvious once you direct your attention toward it in this new day.  Once you remove the c-cam, pay particular attention to the copper brush that rides up against the cam.  With the battery connected, depress the brush a few times using your finger to see what happens.