Dimming head lights?

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

  1. s5belford

    s5belford Epic Member 5+ Years 1000 Posts

    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 Epic Member 5+ Years 1000 Posts

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

    ZSI52 Epic Member 5+ Years 500 Posts

    Mine does that all the time

    I always find myself doing that.
  4. TritonBoulder47

    TritonBoulder47 Rockstar 4 Years 500 Posts

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

    TRPLXL2 Epic Member 5+ Years 1000 Posts

    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 Epic Member 5+ Years 1000 Posts

    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 Epic Member 5+ Years 1000 Posts

    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 Epic Member 5+ Years 1000 Posts

    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 Epic Member 5+ Years 1000 Posts

    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 Epic Member 5+ Years 1000 Posts

    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

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