horn issue

I went and pulled steering wheels from the closet to compare with your pictures. I think I see the problem and I did mention it earlier.
The heavy steel ring with a end pointing down that cancels turn signals... It is supposed to be resting in a bed of plastic that isolates it from the copper contact ring underneath. Now... look closely at the wheels you have and/or get a OEM meter if you want. Check that there is no connection from part to part. If there is connection the plastic has failed.
I don't see the hard browish color plastic in the pic you provided.
actually, When you do pull the ring off you'll find the copper part was isolated from all surrounding metals.