Horns on a '60 TR3A

["Crockett, Steve" <steve.crockett@analog.com>]

Is is possible to adjust the horns on a TR3A? Right now all I get is a kind
of low burbling sound when horn button is depressed. Ammeter shows current
flowing....I used to get sound when engine was revving above 1500, but now
it has diminished to barely audible.