Re: what about a horn
Probably not enough voltage. You might try connecting two 6 volt batteries in a series circuit to produce 12 volts (if you have an extra one lying around).
Does the horn have an adjustment screw on the back of the housing? I've had similiar issues with some vintage horns...in which the diagragm had to be set just right in order for it to vibrate loudly.
Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction.
- Albert Einstein