caille rbm

[gofastgramps]

I am working on a Caille rbm early style with a magneto. There isn’t a coil so I want to use a buzz box. It looks like the points on the mag are closed most of the time and open to spark where the non mag is the opposite. Is this true? How can a buzz box be used on a mag point setup?

[Tom]

Well, this is interesting, and something I’ve thought about a little. My solution was to use a relay. With the motor points closed, the relay is energized. The buzz coil would be wired to the normally closed terminal on the relay. When the motor points open, the relay would de-energize and yield continuity from the ground to the normally closed terminal, and the buzz coil would fire.

One problem with this system is that you need to wire it up to the motor before you turn it on. If you don’t, the buzz coil will start firing right away. Shocking, I say!

I sure hope someone else has a more elegant solution.

It would look something like this, using a universal 40A 12v relay:

Tom

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[garry-in-michigan]

You will have to use a solid state relay that is open when a voltage is present. Solid state relays are fast acting, with a low current draw. . . 😎

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