1956 horn always on

Page 64 Larry's catalog.20210717_155704.jpg
 
Since your horn is on all the time, that tells me that either the horn relay is defective or there a short to ground in the horn relay control circuit.

Horns.png

Looking at the simple wiring diagram of the horn relay control circuit you will notice when the horn ring is depressed, that grounds the horn relay and causes the relay to close. When the relay closes voltage is sent to the horns and they both activate.

If you disconnect the Black/Yellow wire from the horn relay and the horns keep sounding, you have a defective horn relay. If you disconnect the Black/Yellow wire from the horn relay and the horns stop sounding, either the Black/Yellow wire that runs from the horn relay to the horn ring is shorted to ground, or the horn ring is shorted to ground.

To check to see to the horn ring is shorted to ground, remove the horn ring from the steering wheel and inspect the horn ring insulator (3672) for damage.

Horn Parts.jpg

If it turns out that the Black/Yellow wire that runs from the horn relay to the horn ring is shorted to ground, then the horn wire will have to be replaced.

doug7740
1955 Thunderbird Blue
 
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