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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Urgent - Comet Lucas Dynamo doesn't appear to be charging
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<blockquote data-quote="Matty" data-source="post: 54937" data-attributes="member: 1339"><p>Hi</p><p></p><p>If you are going fairly slowly on a system with a 6volt dynamo with a 12volt regulator then it will not produce enough output to run the headlight at much below 45 mph. A 6Volt dynamo will work with a 12 volt system but is not ideal because the field winding has to work harder and more revs are needed to get the required output. However some people do go for the best but expensive solution of having a 12v armature and field fitted but you will be lucky if this is the case.</p><p></p><p>First check the dynamo on its own by pulling out the connector to the battery/ampmeter from the dynamo(usually marked D ) and if fitted the connection to the field winding (usually marked F). Sometimes there is a two pin connection but with conversions the field is sometimes taken directly from inside the dynamo casing to the regulator - often coloured green.</p><p></p><p>Then connect a voltmeter between D and the frame/engine and run the engine say up to 2000 revs. You should read the voltage produced by the dynamo from residual magnetism and it should be around 1.5 volts DC.</p><p></p><p>Next connect the field (F) to D so that this voltage is fed from the dynamo to the field and run the engine again - if the dynamo is OK you should get quite a high voltage (say15/20 volts) at the D/F junction depending on engine revs.</p><p></p><p>If this is OK then the dynamo is probably in good shape and the fault is the regulator, the wiring or the battery.</p><p></p><p>Some electronic regulators will not produce output if the battery is flat and in any case perform poorly at low engine revs. I have found that the regulator made by Dynamo Regulators works from a flat battery and gives better output at lower revs. I would like to point out that I have no commercial axe to grind with them however but just found them good to deal with and having a great product.</p><p></p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 54937, member: 1339"] Hi If you are going fairly slowly on a system with a 6volt dynamo with a 12volt regulator then it will not produce enough output to run the headlight at much below 45 mph. A 6Volt dynamo will work with a 12 volt system but is not ideal because the field winding has to work harder and more revs are needed to get the required output. However some people do go for the best but expensive solution of having a 12v armature and field fitted but you will be lucky if this is the case. First check the dynamo on its own by pulling out the connector to the battery/ampmeter from the dynamo(usually marked D ) and if fitted the connection to the field winding (usually marked F). Sometimes there is a two pin connection but with conversions the field is sometimes taken directly from inside the dynamo casing to the regulator - often coloured green. Then connect a voltmeter between D and the frame/engine and run the engine say up to 2000 revs. You should read the voltage produced by the dynamo from residual magnetism and it should be around 1.5 volts DC. Next connect the field (F) to D so that this voltage is fed from the dynamo to the field and run the engine again - if the dynamo is OK you should get quite a high voltage (say15/20 volts) at the D/F junction depending on engine revs. If this is OK then the dynamo is probably in good shape and the fault is the regulator, the wiring or the battery. Some electronic regulators will not produce output if the battery is flat and in any case perform poorly at low engine revs. I have found that the regulator made by Dynamo Regulators works from a flat battery and gives better output at lower revs. I would like to point out that I have no commercial axe to grind with them however but just found them good to deal with and having a great product. Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Urgent - Comet Lucas Dynamo doesn't appear to be charging
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