headlights dimming while driving?

2001 BUICK CENTURY
85,000 MILES • 6 CYL • FWD • AUTOMATIC
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MSTEVE
  • MEMBER
  • 1 POST
When driving all interior lights and headlights go dim and then go bright again and again. I have replaced the battery already and it did not help. Any advice would be greatly appreciated.

Thank you
Jan 22, 2008 at 4:55 PM
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MASTERTECHTIM
  • ✓ASE Certified Mechanic
  • 4,750 POSTS
  • ASE Certified Mechanic
sounds like a bad alternator or a loose ground.
Jan 22, 2008 at 6:33 PM
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DGOOGIN88
  • MEMBER
  • 5 POSTS
like mastertechtim said,its with the alternator,more specifically the voltage regulator inside the alternator.they are $20 at autozone and is way cheaper than buying a new alternator.if you need instructions on how to change it,let me know
Jan 11, 2009 at 8:50 PM
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