The Stovebolt Site Forums The Shop Area The Electrical Bay Old Horn

I think I’ve reached the end of the road in my effort to salvage the old horn. I was able to separate the structure by drilling out rivets. With the diaphragm removed I could see that the armature was not seized, it moved freely.
I did observe 2 malfunctions:
- The opening of the points did not drop the electromagnetic field. The hum I was hearing was caused by the magnetic plates failing to separate, drawn together even though the points were open , field hot and parts getting hot.
- Even if the field had been cycling as intended, the magnet strength is insufficient to allow the armature to overcome the tension of the phenolic plate that one side of the points is mounted on. The only way I could get the plates & armature to move was to back the tension way off.

The internal fasteners and tension screw head were marred up indicating that someone had already attempted to repair the horn. Somewhere there must be a short because the points are inoperative. Lots of corrosion.

I gave it a good try , l now know how an electric horn is supposed to work, but I think this one is kaput.

Thanks for trying, guys.