The ID tag is too deteriorated to tell the color of paint it had originally, but the number appears to cross reference to a 6V generator for a 1953-54 Corvette. 6V Delco electrical parts had black painted ID tags- - -12V tags are red. It cannot recharge a 12V battery.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!