[Kurt in NJ]

With the fan on the generator changing to an alternator there has to be a compromise with the pulley---either you spin the fan too fast to make the alternator happy, or you spin the alternator too slow and make the fan happy

from my perspective the generator is more reliable, 3 of my old cars have generators the chevy has alternator , in 35 years 3 chevy alternator failures, no generator failures