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Yes, voltmeter on battery terminals, check before starting (should be about 12.3~12.9v) then started it should climb to about 13.95v ish volts by 3~4000 rpm. Job done, if it doesn't climb above original volts, nothing is happening.
If you haven't got a meter, Run the bike in a dark place, turn on the main beam,slowly increase the revs, lights should brighten until about 2,000rpm when they dim slightly as the regulator kicks in. If you hold the front brake on as well, the stop lamp will do the same. Sent from my SM-A750FN using Tapatalk
As ever Ted I am following your lead. I've done 90 miles now and only just started to think about charging. I have a new Motobatt so it would probably cover that mileage without a charge. When fully charged it measures over 13 volts, can't remember the exact figure. Checked today and it is at 12.4 volts so I will need to keep an eye on it and do the voltage test when running tomorrow. I'm guessing you have a new battery too.
At the regulator connect the black and white wire and see if charge rate goes up
Yes mate, that should put full battery voltage to field coil and give max generator output