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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Battery Charging Help!
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<blockquote data-quote="LoneStar" data-source="post: 173049" data-attributes="member: 585"><p>Most of these have now been converted to electronic regulators, which requires changing the internal wiring (simplifying), and removing the cutout device found under the dynamo cap. With the simpler wiring, you test the dynamo by disconnecting the regulator, jumping the two output wires 'F' (field coil) and 'D' (armature output) together, spinning the unit and observing voltage output (between dynamo case earth and the jumped wires). The jumper effectively sets the dynamo to full output; you should get at least 7V at less than 3000 rpm. (Don't let it rise much higher.)</p><p></p><p>I've not tried this on a dynamo with the original wiring, but it may work.</p><p></p><p>First try the "motor" test described in the article, though. This also "flashes" the field coil, magnetizing it slightly. Loss of this magnetism is sometimes the cause of no output.</p><p></p><p>If the dynamo has no output, it may respond to simple measures like cleaning the commutator or replacing the brushes. Worst case, you may need to replace the field coil (unlikely) or armature; not rocket science, and cheaper than replacing it with an Alton.</p><p></p><p>Attached is some doco; the article focuses on Lucas dynamos, but Miller is very similar. One difference is the cutout is in the Lucas regulator box, but inside the dynamo cap on the Miller.</p></blockquote><p></p>
[QUOTE="LoneStar, post: 173049, member: 585"] Most of these have now been converted to electronic regulators, which requires changing the internal wiring (simplifying), and removing the cutout device found under the dynamo cap. With the simpler wiring, you test the dynamo by disconnecting the regulator, jumping the two output wires 'F' (field coil) and 'D' (armature output) together, spinning the unit and observing voltage output (between dynamo case earth and the jumped wires). The jumper effectively sets the dynamo to full output; you should get at least 7V at less than 3000 rpm. (Don't let it rise much higher.) I've not tried this on a dynamo with the original wiring, but it may work. First try the "motor" test described in the article, though. This also "flashes" the field coil, magnetizing it slightly. Loss of this magnetism is sometimes the cause of no output. If the dynamo has no output, it may respond to simple measures like cleaning the commutator or replacing the brushes. Worst case, you may need to replace the field coil (unlikely) or armature; not rocket science, and cheaper than replacing it with an Alton. Attached is some doco; the article focuses on Lucas dynamos, but Miller is very similar. One difference is the cutout is in the Lucas regulator box, but inside the dynamo cap on the Miller. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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