A generator can be polarized either way. The part numbers might not match up between Chevy and GMC, but as long as it's polarized properly the charging system should work OK. Not so for regulators- - - -most of them are polarity-specific.
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!