Aramature is the rotating part. Field is the two coils attached to the generator frame.
And if this is a flathead, it's a 45 cu. in. engine, not a Panhead.
Brotherhood of Grey Beard Bikers
Brotherhood of Warriors Veterans Motorcycle Club-retired
I Am My Brother's Keeper
...care for him who shall have borne the battle and for his widow and orphan...
Texas Confederation of Clubs