[V8] Q Re Voltage & Alternator

[RichardMor at aol.com]

My alternator voltage output is right around 13.0 volts at all RPM's.  It's 
not enough
to keep the battery charged fully, but after a few days, looses enough charge 
to not
start the car.  Anyone ever experience this problem?  I'd think if my 
alternator brushes
were worn I'd see a fluctuation in voltage with RPM.  Could this be a symptom 
of a
defective regulator?  Would appreciate any feedback.
Thanks,
Richard Morris
Renton, WA
90 V8 Auto Dk Blue/Dk Blue