BOSCH alternator

The alternator in B-Vectra was replaced into new one,no remarkable change was to be recognized in the charging capabilities, before/after.
The gravity of electrolyte reduces after a month and a half with black colored indicator.

BOSCH 120A alternator looks like having enough charging capability judging from the number 120,but actually not? Out put voltage is controlled at 13,5V no more,on the other hand DENSO's controlled voltage is 14,5V.
The difference of charging input voltage 1V has deeper meaning for charging capability and battery's life.

The control terminals are D and ignition lamp,on the other hand for example DENSO alternator has additional terminal to check the battery voltage and to control charging modes.
This difference of conceptions affects in relatively slow traffics like those of Japan.

Understanding the charging bad habit on B-Vectra,I make it a rule to performing some additional charging ceremony every 90 days intervals.
This is the key to continue this mischievous automobile without battery troubles.