I was testing my charging circuit on a car with a generator/dynam. Iknow you get no charge at idle, but at a lope it showed 12.7V. Is that charging? I know an alternator should show 13.5V.
Thanks
Gary
a fully charged battery should show 12.5-12.6 volts/
Generator should show a 14.2-14.5 output.
Alternator= same...over about 14.7 you run the chance of boiling the battery.
Alternator output voltage is 14.2V +/-0.2V with headlights on. Dynamo amps output is normally a maximum of 21A, although heavy duty dynamos with an output of 25A were available. Since even a low-output alternator will put out 35A this explains why many owners have fitted them.