2001 Pontiac Bonneville battery won't stay charged

Tiny
LIFESCRIBE
  • MEMBER
  • 2001 PONTIAC BONNEVILLE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 17,000 MILES
Is it the alternator going bad when the battery will not hold a charge for very long?
Wednesday, October 7th, 2009 AT 10:36 AM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum, possibilities, faulty battery--faulty alternator-- faulty wiring circuits. Have the charging sysyem checked. Use a digitalvoltmeter take a reading across the battery posts, everything turned off. Take a second reading across the posts, engine running, the second reading should be higher than the first, if the alternator and circuits are good. 12.6 volts is considered a full charged battery, engine off, running, should be about a volt higher.
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Wednesday, October 7th, 2009 AT 10:47 AM

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