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Tech. Advice: Series 'A' 500cc/1000cc Bikes
B.T.H Magneto-Generator Series 'A' Comet
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<blockquote data-quote="Simon Dinsdale" data-source="post: 72306" data-attributes="member: 58"><p>The BTH mag-dynamo fitted to the earlier series A singles is a permanent magnet field. That means it does not have a wound electrical field winding like most later dynamos. I have one fitted to my A Comet. As there is no field winding to switch in or out with a regulator, the usual bobbin regulator or modern electronic regulator cannot be used. Originally a cutout was fitted to the top of the toolbox, and that is all it was, a cutout and not a regulator. This stopped the battery discharging back through the Dynamo, but a modern diode can be used.</p><p>The charging was controlled via the headlight switch. Off means lights off and no charge from the Dynamo to battery. Charge on the switch connected the Dynamo to the battery via a resistor so to keep the charge rate low. When switching the headlight on, the charge resistor was bypassed so giving full charge.</p><p>The Miller mag-Dynamo fitted to later series A singles was a different device.</p><p>Simon</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 72306, member: 58"] The BTH mag-dynamo fitted to the earlier series A singles is a permanent magnet field. That means it does not have a wound electrical field winding like most later dynamos. I have one fitted to my A Comet. As there is no field winding to switch in or out with a regulator, the usual bobbin regulator or modern electronic regulator cannot be used. Originally a cutout was fitted to the top of the toolbox, and that is all it was, a cutout and not a regulator. This stopped the battery discharging back through the Dynamo, but a modern diode can be used. The charging was controlled via the headlight switch. Off means lights off and no charge from the Dynamo to battery. Charge on the switch connected the Dynamo to the battery via a resistor so to keep the charge rate low. When switching the headlight on, the charge resistor was bypassed so giving full charge. The Miller mag-Dynamo fitted to later series A singles was a different device. Simon [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
B.T.H Magneto-Generator Series 'A' Comet
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