2001 Pontiac Bonneville battery won't stay charged

2001 PONTIAC BONNEVILLE
17,000 MILES • 6 CYL • 2WD • AUTOMATIC
Avatar
LIFESCRIBE
  • MEMBER
  • 1 POST
is it the alternator going bad when the battery will not hold a charge for very long?
Oct 7, 2009 at 10:36 AM
Advertisement
Avatar
JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
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.
Oct 7, 2009 at 10:47 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
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.