Dimming head lights?

Discussion in 'General Chevy & GM Tech Questions' started by s5belford, Dec 9, 2009.

  1. s5belford

    s5belford New Member

    I have a 09 Silverado with 11,000 miles and the headlights seem to dim too easily. If I'm driving along at night with the windows up and try to roll up the windows (when checking to make sure they are closed) and the headlights dim at a very noticeable level.

    Has anyone experienced this?
  2. unplugged

    unplugged New Member

    Tapping the power door lock buttons to the beat of the radio makes for a nice light show too.:glasses:
  3. ZSI52

    ZSI52 New Member

    Mine does that all the time




    I always find myself doing that.
  4. TritonBoulder47

    TritonBoulder47 New Member

    All my vehicles have done that...
  5. TRPLXL2

    TRPLXL2 New Member

    Both of my Silverado's did that too, I think it's a quirk just like a Harley leaking oil they all do that LOL!
  6. pmf608

    pmf608 New Member

    Ive never noticed this happen on any vehicle I have driven, except the re-worked electronic system on the 2007+ GM vehicles - trucks, an 07 impala i drove once, and my moms 08 buick lucerne. I also saw a cobalt the other day that couldn't handle its stereo at a stop. The guy had a sub in it and everytime it hit, his brake light lost AT LEAST half of their brightness (although this was hardly the fault of the car - you just shouldnt put that into a car with and alternator that cant handle it at idle).
  7. vncj96

    vncj96 New Member

    Are your lights dimming when you are "driving" or waiting at a light at idle with the foot on the break. If you are driving there is no way that should ne happening, I would suspect a weak alternator, or loose connections.
  8. s5belford

    s5belford New Member

    Stopped or driving it does it, and it drives me nuts! my ****box 95 jimmy never did it and I had 2 10" subs. I really don't think its right even with everyone else saying its normal....
  9. Jimmiee

    Jimmiee New Member

    Well my truck doesn't do that. If it did I would get out my volt meter and find the problem. It's probably a bad ground but it could be a bad connection in the power distribution box. I would start by cleaning the battery cables. Then start checking grounds with a volt meter while the lights are dimming.
  10. vncj96

    vncj96 New Member

    i can see it dimming a bit when you are at idle, but if you have no accesories drawing extra power then it should never happen especially while the vehicle is moving. i have 2 subs and 1000 watts between two amps and NO capacitor and it never even dims when bass hits at idle. Something is drqwing power, loose connection or corrosion sucking power from alternator or battery
  11. pmf608

    pmf608 New Member

    on the lucerne, if we are moving, it usually takes 2 windows to be switched at once to dip the power, but still can happen. On the 07 impala i drove, something about its electrical made it dim the lights with as little as running one window that was not already at its stopping point. I cannot see my truck ever having this type of problem without alternator failure (when i finally get power windows) because i can run my stereo crazy loud, and the only time it will affect anything is when its loud and the truck is off, in which case it will dim the LED lights wired to its stand or the interior lights if they are on.

    Other than that, I find it to be much more common on 07+ gm vehicles for the elec. system to be set up in such a way that power windows will dim the lights.

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