Horn won't work
 

I am trying to get a spare horn working. It seems as though the armature is too tight when I adjust the tone. If I back the screw out, I can get the horn to spin like mad. When I start turning the screw in, it almost bottoms out & then the horn won't spin. I also never get the horn sound. I have a repro diaphragm in it as the old one was cracked around the point that rubs. I have new thin gaskets & even had new brushes & springs in the horn. The armature has been cleaned & the grooves cleaned out on the comm. I had made a new felt for the top end & oiled the felts on both ends. If I push down on the armature with one hand & turn it, then I can feel it make contact with the rubbing wheel. I've been testing with a charger. It just seems like the armature needs to go down farther to contact the wheel but I think that pressure is what stops the armature from spinning thus no sound. I'm thinking of making a gasket for the top of the diaphragm out of paper & see if this gets me closer or bend the bracket that is on the bottom of the noise wheel. What are your thoughts?

Re: Horn won't work
 

Is the diaphram oriented correctly?
The lines of the wavy wheel must strike the diaphram chisel point in the same line.


You must use a fully charged battery, and the adjustment screw should only be turned until the wavy wheel meets the chisel point, and then no more than 1 to 3 clicks more most times.

Re: Horn won't work
 

If you installed new brushes they can take a bit to seat. Also a horn no load draws about 3-4 amps so your battery charger may not have the oomph if its a 2amp or 4 amp.

Yes the oohga is the wavy washer just barely striking the chisel point on the diaphram - doesnt take much to put to much pressure on it.

Re: Horn won't work
 

I solved the problem. It may be that the wavy ratchet is worn. I took a thin washer & drilled the hole to go over the armature shaft before installing the ratchet. I can now get it to work on the charger. My charger is a bigger variety.