HELLO MY HEADLIGHTS INTERIOR LIGHTS AND DASH ...

  • Tiny
  • Anonymous
  • 1996 Buick Regal
  • 155,000 miles

Hello, my headlights, interior lights and dash lights are flickering when car is running, what could be the problem? The car is a 1996 Buick Regal

Saturday, February 9th, 2013 AT 5:12 AM

1 Answer

  • Tiny
  • caradiodoc
  • Expert
  • 24,972 posts

Defective generator caused by a battery that is more than two years old is the most likely answer. Due to their design they develop huge voltage spikes that can destroy the internal diodes and voltage regulator. With one bad diode the generator will only be able to develop one third of its rated output, and the regulator will jump all over trying to respond to the voltage dropouts caused by the excessive "ripple". A professional load-test will identify the reduced maximum output and the excessive ripple.

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Saturday, February 9th, 2013 AT 7:12 AM

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