Hello, I have a Lucas dynamo, E3LM, clockwise rotation looking from the drive end, off an M20. Could anyone advise a method of testing this on the bench. I have scoured the internet and it is all a bit confusing. Thank you, Roland.
Have you read this article:
https://www.matchlessclueless.com/electrical/lucas/testing-lucas-dynamo/
I have already read this but the testing is done with the dynamo on the bike. As my engine is currently in pieces this won't work. I was looking for a way to test it on the bench with nothing connected to the bike. Thanks for your reply, Roland.
You could consider testing if it motors.
https://www.themagnetoguys.co.uk/dynamo-motor-test
Thanks Julian S, I've done that, I just want to test the output so that I know it is good when I come to refit it. Cheers, Roland.
i have a turned down socket extension that i put in the electric drill with a socket on the end and run it up, always worth trying the oppisate way as well if it puts current out the wrong way swap the field coil wires over
On the subject of dynamos, I have just replaced my original short body Lucas 6 Volt dynamo with a long body version altered to provide 12 Volts. I was wondering whether there is some sort of special tool to secure the unit to the timing chain case? Mine appears to be a round headed nut, thus no grip other than pliers etc, with a slot across it which cannot accept a screwdriver because the bolt from the dynamo protrudes past the round headed nut and prevents screw driver access to the slot - weird! B33
Find an old deep socket and cut the end to make tongues to engage with the slots. This is what I do.