common faults on alternator. on 2006 Jeep Commander

my alternator charge light comes on and only goes off at high revs,>3000 also makes whinning noise which continues and dies down after engine stops

by in Tacoma, WA on October 22, 2012
2 answers
ANSWER by on October 22, 2012
sounds like a bad regulator in alt and poss a bering issue also
ANSWER by on October 22, 2012
PCM regulated ,maybe have scanned to watch for proper control. Pulley poss. is 'clutched' that or bearing ,as globalhelper mentioned may also be faulty.