A horn relay is rectangular or square shaped with 3 or more legs at the bottom.įirst of all, you should find out where the horn relay is located in your particular model of Thunderbird. A bad relay can also be the cause of horn failure on your Ford Thunderbird. Relays are electromagnetic switches that are used to switch electrical loads on and off. It does not matter in which direction you insert the fuse. You must replace it with one of the same amperage and therefore the same color. If the metal strip is broken in the middle, the fuse has blown. To check the fuse, pull it out of Thunderbird’s fuse box using a fuse puller or needle nose plier and hold it against the light. If the fuse is blown, replace it with a new one with the specified amp rating. In case of a faulty fuse, the circuit is interrupted and the horn can not work.Ĭheck your Thunderbird’s owners manual or the fuse box cover to find the exact location of the fuse for the horn. The horn on Ford Thunderbird needs electricity to work.

77 ford thunderbird