How to fix no sound a car horn on a 1995 GMC Jimmy?

Take a 12v test light to the horn connection to see if there is power. Chances are the horn is bad( many were) you can get one at a salvage yard ($10). If there is no power it may be a bad horn relay; You can check with Autozone locator on line to find out location of the relay on your vehicle.I hope this helps you. Mark