Question about 2000 Pontiac Montana

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Flickering lights on 2000 Montana

Lights pulse when vehicle is running. I believe it to be a ground problem but don't know where to start.

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  • carson_rm Jan 06, 2009

    I also experience the same problem. ALL lights pulse, including the headlights, it is VERY noticable and happens at all speeds.

  • dave_6t5 Jan 15, 2009

    Mine is more prominent at idle or low speed. I had been informed it is caused by a defective alternator which sends a false message to the battery and charging system, this has not been confirmed though.

  • frozennorth Jan 18, 2009

    My interior lights and headlights also pulse, but are most noticeable at slow speeds.

  • bmrracing Mar 31, 2009

    I had the same problem when all lights in and outside of my van were flickering. It became so bad that at night if i was following cars they would pull over. Come to find out that is was my altenator. It was over charging. we put in a smaller one and it works fine now


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I had the same problem with my van, after taking it to the dealer they said it was not the alternator and could not explain the problem of the flickering. I'm not an electrical genius, but after i done some research of my own i learned it could be the diodes inside of the alternator. At this point I had 2 options, rebuild the alternator I had (with a one year warranty) or buy a remanufactured one (with a life time warranty). I chose to buy a remanufactured alternator and have had no problems with the flickering. Note: carfully inspect remanufactored alternator before leaving part store. I did not inspect part until pulling it out of box after 2 hours of knuckle busting labor to find out that new part had a busted housing.

Posted on Mar 02, 2009

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I have been told there is a ground wire under the hood that is used for the dash lights and has a problem about coming loose or corroded. Hope this helps.

Posted on Jan 06, 2009

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Do you have a alarm system malfunction? or is it a relay timer switch

Posted on Jan 04, 2009

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