MTFCA Forum

I’m trying to adjust my horn, it has stopped blowing.
In the past, a simple turning of the screw in the rear , would bring it back.
Not this time,
Please note the horn manufacturer, in the photos.

George
Elkhorn, Nebraska

Back it off and lube it with a light lubricant like 3 in one. See if you can get the armature to spin freely without engaging the diaphragm then turn the screw in until it blows.

Would do good to clean the contacts while you have the cover off to oil the shaft.

It's funny how we get stuck with things. Bulb horns actually were blown by the air sqeezed out by compressing the air in the bulb. Later horns don't "blow "at all.
Motor driven horns make their racket by driving a notched stem against a similarly notched boss on a diaphragm, that racket being amplified by the horn bell.
If the motor works it is a matter of adjusting the load on the two mechanical parts until they produce the desired noise.

Allan from down under.

Unprr wrote: ↑

Sun Oct 19, 2025 5:44 pm

I’m trying to adjust my horn, it has stopped blowing.
In the past, a simple turning of the screw in the rear , would bring it back.

Double check power and ground. Could be battery voltage too low.

The insides are most the same for motor horns, you may have to oil some spots; or clean the armature where the brushes contact, should be bright. No oil should be there either.

Adjusting is with the screw to place force on the gear to rub the diaphragm.

Does the horn motor run at all, or is everything totally dead?

As to being able to adjust it in the past, with anything, there is only so much adjustment you can do before you simply run out of adjustment and things become too worn out. You've been given some good advice, above, but to help you further, you're going to have to do some detective work of your own and report back to us what you observe. Not meaning to be critical of you, but there is only so much that we can do with, "it has stopped blowing", especially with a non-Ford horn.