Hi, The original Altette horn on my '46 C10 has stopped working. Can anyone recommend a repairer please. I've replaced the horn with a cheap modern one but as the bike is in "Barn Find" condition it's just wrong. Cheers, Rick.
Taff the horn used to be the go to place, not sure if he is still in business but he did supply me with new gaskets a couple of years ago
try him at http://taffthehorns.com/
With a bit of patience they can be repaired even by the ham-fisted such as me. ;D
If you remove the domed nut on the front you will see an adjuster screw, at base this is a slotted ring this must be undone before you attempt to adjust. I use a small socket the will go over the screw. Cut the end or file until you have two little bits that engage with the slot on the ring. The ring can be tight. Once slackened off attach your leads to the terminals and turn the centre screw until the horn works. This screw adjusts the gap. You can if you are keen put an ammeter inline with one of the leads and watch the amp draw. I prefer to us my ears and and adjust until happy with the sound. The large nut and screw on the back I believe is a stop but I tend to leave this alone. If you are using a 6 volt horn on 12 volt it will work but the pitch will go up an octave, the horn will stand the voltage increase as it will not be operated long enough to damage it. I hope you understand this ok.
Just to add to that, I found that when I rebuilt mine I found it was fussy re the thickness of the paper gaskets. I made new ones out of brown parcel paper which I greased. There's one each side of the vibrating plate, but I found it necessary to double up on one otherwise it wouldn't work.
You are right I did have the different thickness gaskets from Taff the Horn. The easy option is try and adjust it, that is usually all that needs doing. Make sure that the horn is not 12 volt if you have a 6 volt system. It will not work unless the internal coil is changed.