1996 Buick Regal Hello Headlights Interior Lights Dash Flickering Car Running

1996 BUICK REGAL
155,000 MILES
Avatar
ANONYMOUS
  • MEMBER
  • 1 POST
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
Feb 9, 2013 at 5:12 AM
Advertisement
Avatar
CARADIODOC
  • CAR REPAIR CONTRIBUTOR
  • 34,309 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.
Feb 9, 2013 at 7:12 AM
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.