Does your car a standard or woodgrain rimblow steering wheel? Has your car ever had it's steering wheel removed? If so, it may be that it is missing the contacts or the contact rings from the bottom of the steering wheel. If it is a standard steering wheel, then touch a screw driver across both contacts under the horn button. It may also be that your horns are just dead.
1966 Mustang Sprint 200 "Oliver"... factory fog lamps, factory rally pac, off the road for restoration.
2005 Mustang 4.0 litre... Airaid CAI, Honeycomb taillamp panel, more mods to follow.