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Thanks Chris Unfortunately I don't have a Voltmeter, I'll see if I can find a torch bulb to try tomorrow.I'm not even sure if AC motors can be used as generators the same way that DC ones can
Most LED's are killed if you expose them to more than 5V reverse voltage => AC is an absolute NO, NO and as mentioned you also need a series resistor and the size depends on voltage .... all in all - don't use LED's for testing - or perhaps - only use single LED's or better two anti-parallel connected with a series resistor.