My original 40 horns sound anemic. They've been cleaned up and the outside body has been painted. They both sound but lack power and authority. Ground wires are good and secure. The problem most likely is internal parts.
Any suggestions on possible adjustments or a recommended 6 volt horn rebuider would be greatly appreciated.
I recall quite some time ago we had a similar conversation in the 46-48 forum about horn adjustment. You might want to try a search in that forum. Otherwise attached is a photo of a 46-48 ? horn showing the adjustment nuts. Also attached is an instruction sheet we found for these horns.
Try looking through these "horn" posts.........might be helpful