Headlights and dash lights pulsing

Tiny
MARTINJR
  • MEMBER
  • 2005 CHRYSLER 300
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 104,500 MILES
When turning on lights and when switching from dim to bright the headlights and dash lights pulse at a rate of about 3-4 pulses per second. This also happens with less intensity when the brakes are applied or turn signals used. The pulsing usually diminishes or stops in a minute or so but it is taking longer lately. The car has been starting well in cold weather. I have checked all the battery grounds?
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Sunday, December 6th, 2009 AT 8:47 PM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
I would check all body to chassis ground and if they are okay the PCM controls the alternator output which is what might be going bad. I would try a new alternator first though because the voltage regulator can be going out.

Here is a guide to help you

https://www.2carpros.com/articles/how-to-replace-an-alternator

Please let us know what you find.

Cheers
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Monday, December 7th, 2009 AT 10:45 PM

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