2002 Buick regal intermittent headlight pulsing

[mikeytcarter]

Hello everyone!

i have recently acquired a 2002 Buick Regal. This car was a one owner car and I picked it up in October with 74k miles on it. It has been very well taken care of. I bought this car because of the reliability factor, however I have fallen in love with how it drives! The only issue that I am having is intermittent headlight pulsing. It only happens when the car is decelerating and slowing down under 30mph or so. So far I have replaced the battery, had the alternator tested(tested good ), went and bought another alternator and installed just in case of possible voltage regulator. Also found and cleaned thee grounds under the fuse box, next to the drivers headlight, and the engine ground by the exhaust. I have also ran a big 3 wire upgrade (did this for future sound system) as well as an extra power wire from fuse box to alternator(saw some videos where people said this extra line helped)This seemed to make my headlights a bit brighter, but not affect on the pulsing. All that being said i am still getting the same result. The interior lights will dim for a moment when the car first starts and the the headlights on deceleration. From what I have found there is no headlight relay, only fuses. I have one friend who has suggested new bulbs, however I am not convinced this would fix anything as they are older but still light up well. Any suggestions on where to look next would be greatly appreciated! 

[mikeytcarter]

 

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Edited 1 hour ago by mikeytcarter

[mikeytcarter]

[Black92GS]

You'll have to define the pulsing.  Is it like a continuous flicker, or is it more along the lines of a large draw where the lights briefly dim once and then come back up?

[mikeytcarter]

The latter would be a better description. It’s like a large draw and they will dim then go back to normal. Sometimes it does it once’s, sometimes a few times in a row