What fuse is the horn fuse on 1989 mercury topaz?

On a 1989 Mercury Topaz, the horn fuse is typically located in the fuse box under the dashboard. It is usually a 15-amp fuse, but it's always best to check the owner's manual for the specific location and amperage, as there may be variations based on the vehicle's configuration. If the horn is not functioning, inspecting and replacing this fuse is a good first step.