I just wanted to know how I would go about installing an external horn in my 89 RS. My horn won't stop blowing so I disconnected the horn through the convienience center under the steering wheel. Now I want to install the external horn button. Which wire (color) do I cut and attach to the external horn button? and what else do I attach to the external horn button?

All the horn button does is ground a wire. The horn wire is black in the wire bundle from the steering column, so just hook the black wire to one side and ground to the other side of the switch and honk away.