The horns have an adjuster. It is a screw with locknut, plainly
recognizable. You can try to adjust this screw bit by bit for max sound.
This will vibrate of some of the dirt or rust that prevents your horn
from producing a proper level of sound. If there is no success you can
try to take the horn apart and investigate what the problem is. However
it is usually not worth the trouble as you will probably find that all
is more or lees rusted solid.
No problem to connect it up straight to a battery.
Just tap both horns with small wrench or some other metal object and you
will know from the difference in sound which is the low and which is the
high note one.
Kees Oudesluijs
NL
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