[Vwdiesel] Charging Problem

[Chuck Carnohan]

My '84 is running great but I can't figure out why the battery isn't
getting a full charge.  After about a week of driving the battery will
gradually lose it's charge (quicker if driving at night with lights).
I've cleaned grounds, checked for continuity.  The alternator is a Bosch
reman putting out 15 volts at the connector.  After the connector it
immediately drops to 11 or 12 volts depending on the load.  When the
lights are on it drops to 11.8!  After a bunch of testing and cleaning
of terminals and grounds I now have the battery light staying on more of
the time than before.  Any suggestions?

 

Chuck Carnohan