There is a high and a low horn. The two notes make the horn more attention getting. First make sure the horn has a really good ground. Many times the ground connection rusts up. The horn is just a diaphragm that vibrates and when it does it opens and closes a set of contacts. The contacts can pit and corrode. Some horns have a nut on them to change the note. They are so cheap that repair is a waste of time. An OEM is $51 a replica is only $37. Or Pep boys probably has some even cheaper.
This forum is owned and operated by Internet Brands, Inc., a Delaware
corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford
Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor