Do you have a tilt steering wheel ?? If so then more then likely the wires are shorted out where the wheel tilts. Common problem.
steering colm for 1989chev silverado
try www.haynes.com
go to eBay and buy a whole setup for the steering column
Under the dash on the left side of the steering column.
on the top side of the steering column under the dash
the wire in the steering column is shorting out
Diagram of 1990 chevy truck steering column
A bad brake light switch, and it is bolted to the steering column in under the dash.
How do change a light on a steering column in a 2006 chevy truck?
The steering column has to be replaced. The steering column has to be replaced.
You can get a Chevy steering column parts diagram at most Chevrolet dealerships. Chevrolet service manuals will have the steering column parts diagram and can be obtained from most local libraries.
it is easier to repair the OEM horn assembly than to "rig" up a button