hi. all other lights work, fuse good, all bulbs good. horn works. didn't find any matching thread. any suggestions that hopefully don't include ripping the steering column apart? thanks!

 

Are the driving, side marker and other lights not working? Probably the ground is loose or broken.
Highmount brake lamp uses its own ground.
Tails and license plate lights use ground G601 located on the left side of the trunk. Follow the harness from the lights.