LEAKOIL Forum

I am kinda fascinated by the old adjustable buzzer horns on my old BMW bikes and my old VW buses.
Thought I'd show ya what is going on inside on in case you haven't seen.

They are adjustable and rebuild able unlike newer horns.

When power 6v or 12v is applied to the horn a coil pack is magnetized which causes the bar on the thin buzzer plate to be drawn towards the now magnetized metal block on either side of the coil pack. As the plate approaches the magnet it then contacts the tab on the point plate, which in turn breaks contact with the points turning the power off to the coil pack. This happens very rapidly causing the metal plate to jump back and forth shaking the buzzer plate and making noise/vibration.

When you turn the adjuster screw it changes the height of the point tab which changes the amount of contact the points make and then changes the tone of the horn.

Maybe the experts can chime in if I missed something or got something wrong.

Great stuff. I love picture lessons!

Can i send you mine to fix?

The one on my 61 didnt work when I got it...I had to rewire the horn and tested it with Randy's so I know it was the horn that was broke

I even took it apart but didnt really know what I was looking at haha

vw7266 wrote:Can i send you mine to fix?

Sure send it up. You have my address.

Good information Greg. I have a couple old 6 volt horns that don't work, now I'll try to fix them.

Many times the points just need filed kinda like in your distributor.

cool I'll mail it up this week. I have to find it...hopefully its still layin around my parents garage I think thats where it is...If I cant find it oh well