Note that the voltages described are applicable to the standard 6 volt dynamos and to those which have been reconfigured to give 12v output using a modern electronic regulator.The voltages from dynamos which have been ‘upgraded’ with 12v coils will of course be proportionally higher.Singer Tweet has found love…and it’s in the church.
Also, my bike has been re-wired so don’t go by the colours of the wiring shown as these will almost certainly be different to your bike.
The Lucas dynamo types that this article specifically applies to are models E3L, E3LM, E3N and E3NL.
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This guide to testing a Lucas dynamo is based upon my experiences with my 1951 Matchless G3LS, although the same principles should apply to other Matchless and AJS bikes (and indeed to other bikes and cars of the same era which also use the Lucas dynamo charging system).