2001 Pontiac Firebird alternater

2001 PONTIAC FIREBIRD
59,000 MILES • V8 • 2WD • MANUAL
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TA7601
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My alternater has been squeeling off and on. My gauge will say I'm only at 10v but when I pull over and check the battery it is around 13.9v Which one do i believe?
Apr 25, 2009 at 4:35 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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