My alternator is starting to give me warning signs also.
I got on the throttle a few days ago, and as the RPMs rose up over 5000 rpm,
the battery light slowly went from dim to bright as the RPMs passed 6000.
When the RPMs went back down the light went off and the voltage returned to normal.

Too bad I can't replace just the brushes and regulator.

Pete...

98.5 SE Sport Duratec ATX (P66L)
Black Clearcoat on Greystone
DOB 11/21/1997
DOP 12/25/1997
PIAA 510 Super White Driving Lights
SVT CAT-BACK EXHAUST (No Resonator)
DiabloSport Chip (LPQ4) - Engineered To Raise Hell
Too many other mods to list...
Sounds sweet, runs quick...
Crazy Horse Dyno @ 121.4 WHP/129.6 TQ