testing a dynamo

Did you polarize the new generator on installation?
Will the generator motorize?

[quote="Old Magnet"]Did you polarize the new generator on installation?
Will the generator motorize?[/quote]

yes, we flashed it and still the same

Was that before or after the damage was done?

Check to see if the unit will motor.
Remove the generator, or disconnect belt, hook + lead to the Armature post and - to ground.
If unit runs as a motor then the regulator is most likely at fault.

[quote="Old Magnet"]Was that before or after the damage was done?

Check to see if the unit will motor.
Remove the generator, or disconnect belt, hook + lead to the Armature post and - to ground.
If unit runs as a motor then the regulator is most likely at fault.[/quote]

both times......

will go and check if it motors now and report back

thanks OM

[quote="Old Magnet"]Was that before or after the damage was done?

Check to see if the unit will motor.
Remove the generator, or disconnect belt, hook + lead to the Armature post and - to ground.
If unit runs as a motor then the regulator is most likely at fault.[/quote]

both times......

will go and check if it motors now and report back

thanks OM

so yes, it will motor, albeit slowly with quite a lot of smoke from the brush area......(its in the vice, not on the machine)

Sometimes it needs a bit of a push on the pulley, but once its turning it will continue

edit:

just read your motor test info.
With earth on the field windings it spins beautifully.
With the earth just hooked to the end casing it makes harder work of it all (smokes a bit)

so yes, it will motor, albeit slowly with quite a lot of smoke from the brush area......(its in the vice, not on the machine)

Sometimes it needs a bit of a push on the pulley, but once its turning it will continue

edit:

just read your motor test info.
With earth on the field windings it spins beautifully.
With the earth just hooked to the end casing it makes harder work of it all (smokes a bit)

That's not good, recheck the two step process I just posted. Seems you have a generator problem, likely field coils.

Is there a tag on the generator?
Type A would be the norm for a D4D. (USA version)