RUN- - - - -do not walk away from that fake generator! There's a reason alternators are short and large diameter- - - - -the physics of creating alternating current doesn't work right in a long, skinny housing. An alternator creates 3 phase AC current from the stationary stator windings in the outer housing, and then rectifies it into a fairly stable DC flow with six heavy duty diodes. A generator creates a pulsating DC from the spinning armature, thanks to the commutator bars at the end of the armature.
Jerry