All lights dimming up and down?!?!?! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-31-2006, 12:53 PM   #1
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Default All lights dimming up and down?!?!?!

Hi All,

I have a 2000 Bonneville and all the lights(dash, interior, headlights) pulse up and down when the outside lights(headlights and tail lights) are on. There are short periods of time when they dont pulse but most of the time if the headlights are on its doing it.

Thanks for any help.
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Old 01-31-2006, 01:14 PM   #2
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battery or alt going bad...

take off the alt and bring it to autozone and have them test it...

new batteries go under the back seat and are rather expensive.. $100 for mine
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Old 01-31-2006, 01:46 PM   #3
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Thanks I will do that. Also i have the fuel gauge problem(dosnt read below half tank) that i have been reading up on in this forum and it sounds like my light problem has nothing to do with fuel gauge problem.
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Old 01-31-2006, 05:10 PM   #4
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I do have a volt gauge on the dash and it is running two clicks past the 14 volt mark
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Old 02-04-2006, 01:53 PM   #5
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My car just started doin that the other day....it'* only done it a coupla times, but its pulsing every now and then....and my volts are a t 14.2. I dunno whats goin on.
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Old 02-05-2006, 03:36 AM   #6
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Quote:
Originally Posted by harofreak00
new batteries go under the back seat and are rather expensive.. $100 for mine
Mine cost me $130; where did you get yours?
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Old 02-06-2006, 12:16 PM   #7
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Now that mine is doing it more often I can watch the gauge drop down below 14 and back up to 14.2+ I had AutoZone check the alternator while it was on the car and they think ití* the voltage regulator in the alternator.
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Old 02-06-2006, 12:40 PM   #8
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Quote:
Originally Posted by Awhit003
Quote:
Originally Posted by harofreak00
new batteries go under the back seat and are rather expensive.. $100 for mine
Mine cost me $130; where did you get yours?
autozone... duralast
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Old 02-10-2006, 11:58 AM   #9
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The problem was the alternator. Thanks for the help
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Old 02-10-2006, 03:24 PM   #10
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Quote:
Originally Posted by jacksky2
The problem was the alternator. Thanks for the help
is sounded like the alternator. I am surprised so many people assumed bad battery.

Remember people the batterys job is just to start the car..then the alternator takes over.
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