Battery or Alternator problem

1996 SATURN SL1
120,000 MILES • 4 CYL • FWD • AUTOMATIC
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JEFFYONKER
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  • 2 POSTS
My daughter's 1996 SL1 is having the "check battery" light going on while driving and the headlights dim. Is this just an old 5 year old battery or possibly an alternator problem?
Dec 11, 2010 at 9:17 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
I'd make sure the battery has a full charge and the charging system is ok. Have to test when problem is ongoing. Some of the national brand autostores will do the testing for you. They will also check for applicable trouble codes. If you have a digital multimeter, we can help you with some testing.
Dec 11, 2010 at 9:23 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
Just wanted to add,engine running, the alternator should carry the load.
Dec 11, 2010 at 9:31 AM
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FIXITMR
  • ✓Experienced Mechanic
  • 9,989 POSTS
lights going dim/dash warning light on indicates alternator not charging.
Dec 14, 2010 at 11:12 AM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
You can do a basic charge rate check with a volt meter Pos to the main output on the alternator and Neg to chassis earth, you will be wanting to see 13.5 Volts there abouts depending on battery charge, do not test by running and removing battery terminal as the voltage spike when reconnected can blow the ECU out of the water so to speak.

mark (mhpautos)
Dec 17, 2010 at 12:54 AM
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