Originally Posted by
stormbringer
wats ur vehicle boss?
Toyota Prado LC90. But same principle with all alternators.
Same symptoms as yours, battery was good but when started only 12.2 or 11.8 volts lang then drops to 10.5-11v nalang with AC and lights on. Took apart the alternator to check kay was thinking maybe the the carbon brush was worn out due to the vehicle being 18 years old but found out there was a burned diode on the rectifier. Didn't bother to repair the diode and just brought a new rectifier, plug and play in the alternator and done