Dating exitacion

19 May

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.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.

Remove them carefully as you’ll need to refit them later and you don’t want them all bent.The dynamo fitted to my bike is a Lucas model “E3NL.0” although I haven’t found many references to this model number elsewhere.I suspect it is basically the same as the Lucas E3N model as it is stamped with a “5” and seems to give about 5 Amps output which is the same as quoted for the E3N.If the negative terminal is connected to the bike frame, then it’s negative earth. You now need to connect the two test leads of your multimeter between the Lucas dynamo and the bike frame to measure the voltage difference between the dynamo and earth.Now here’s the bit you need to get right: if you’re bike is wired positive earth, then connect the positive (red) test lead of the multimeter to a suitable earth point on the bike.