>>Hmm.  I'll have to examine my lawnmower more closely.  I had so far thought
>> it had only a magnet on the flywheel going past a stationary coil, but there

>Look closely at the coil, the coil is actually the secondary of a step up
transformer with the primary being the metal core. The magnetic field
couples into the core and thus into the secondary field. Or at least that is
the way it was explained to me.

Oh, and if you only see two wires, the third may be completed through the
ground or frame.

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