Hiya Dennis Just waking up an old thread. I have just finished the rebuild of a 1966 Stornello and when I started the bike up, the headight was barely glowing. A bit of investigation and both the lighting and charging circuits were only putting out 4 volts max.
I sent the coil off to West Country Windings in Thetford and they are rewinding it as a single winding (Currently it has 2 windings on a single centre and uses the frame as part of the circuit) The new single winding will feed into solid state rectifier / regulator and feed all its power into the battery.
I will then feed battery power into the lighting circuit instead of the standard AC lights. Hopefully I will be able to see at night once it is all connected up.
This upgrade does away with the single diode half wave rectifier if you are still having problems,
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