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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series A parts wanted / needed
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<blockquote data-quote="Simon Dinsdale" data-source="post: 141744" data-attributes="member: 58"><p>If the mag/dyno is a BTH then the cut out box on top of the toolbox in question is just that, a cut out and a 10A diode will do the same job. An electronic regulator will not work as the BTH dynamo is a permanent magnet type and so there is no field winding for a regulator to control the charge. The 4 position switch which has a charging resistor is the crude type of regulator so off is no charge, ch is charge at 1/2 rate through the resistor on the back of the switch, and when the headlight is on then the resistor is bypassed so the dynamo is full charge. As the Dynamo only generates a max 24w of 6v power you won’t boil the battery, in fact you won’t even balance the lights unless LED bulbes are used.</p><p>The cutout box lid is different to the post war Miller units and these BTH cutout boxes are very difficult to find.</p><p></p><p>If you are using a Miller mag/dyno then there is not cutout or regulator on top of the toolbox, but don’t know what regulation they used.</p><p>Simon</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 141744, member: 58"] If the mag/dyno is a BTH then the cut out box on top of the toolbox in question is just that, a cut out and a 10A diode will do the same job. An electronic regulator will not work as the BTH dynamo is a permanent magnet type and so there is no field winding for a regulator to control the charge. The 4 position switch which has a charging resistor is the crude type of regulator so off is no charge, ch is charge at 1/2 rate through the resistor on the back of the switch, and when the headlight is on then the resistor is bypassed so the dynamo is full charge. As the Dynamo only generates a max 24w of 6v power you won’t boil the battery, in fact you won’t even balance the lights unless LED bulbes are used. The cutout box lid is different to the post war Miller units and these BTH cutout boxes are very difficult to find. If you are using a Miller mag/dyno then there is not cutout or regulator on top of the toolbox, but don’t know what regulation they used. Simon [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series A parts wanted / needed
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