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.

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

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.

I do have a volt gauge on the dash and it is running two clicks past the 14 volt mark

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.

Mine cost me $130; where did you get yours?

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 it’* the voltage regulator in the alternator.

autozone... duralast

The problem was the alternator. Thanks for the help