Chevrolet Repair: headlights dimming, serpintine belt, altenator

Question
CJ

 I own A 1996 CHEV S-10 BLAZER 4.3L V6 4WD,My headlights dim
  when I let off the gas pedal,when I give it gas the head
 lights brighten, the Altenator is charging, battery tested
 ok, when I stop and idle in park the headlights dim,when I give it gas the gage shows battery charging ok.
 The serpintine belt is new, Have any idea what tne problem
 can be.

                  Thanks
                   Dom


Answer
Hi Dominick Amoroso,

This is tell-tale classic BAD REGULATOR.  This is located inside the alternator.  Is the alternator producing 14.3 volts?  If it is under 13.8 V then it is not sufficient.

Could also be a loose belt, but today that is rare...with the tensioners on the belts.  This is definately an alternator issue.

C J S