GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 1 of 2 12 Last Post byLast Post by
Results 1 to 10 of 13
  1. #1

    Default Dimming Head Lights Help ?

    Hey all, I have a 2004 GMC 2500HD Crew Cab Duramax and every now and then the head lights will dim almost like they do when your anti-lock's kick on. I have replaced both battery's and put a new high output alternator on the truck and i am still having issues with the head lights dimming. Also it's not showing any defect codes on the computer.
    2004 GMC 2500HD Crew Cab Duramax Fire Dept POV / Work Truck

  2. #2

    Default

    I suppose this only happens when the truck is being driven. What will the voltage gauge do when this happens?

    Quote Originally Posted by Mainefirefighter View Post
    like they do when your anti-lock's kick on.
    Are you saying, every thine the ant-lock brakes kick in the headlights dim?
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  3. #3
    Legend


    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Location
    Piermont,NY, back in Northern NJ now, But may be in IL soon....
    Posts
    5,353

    Default

    What else is in the truck? Lights, Stereo, inverter Eta???
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  4. #4

    Default

    Only when im driving, nothing major except some led's but even when the master is shut off to all the accessories it still dose it.

    - - - Updated - - -

    yes no voltage gage movement and the antilocks dont feel or sound like they come on

  5. #5
    Legend


    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Location
    Piermont,NY, back in Northern NJ now, But may be in IL soon....
    Posts
    5,353

    Default

    Check all grounds first You said you up graded the Alt? What did you go with? Did you upgrade the Wires too?

  6. #6

    Default

    it did it before i replaced the alt and battery's too and all grounds are fine

  7. #7
    Legend


    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Location
    Piermont,NY, back in Northern NJ now, But may be in IL soon....
    Posts
    5,353

    Default

    You did the Big 3? Main grounds and Power wire?

  8. #8

    Default

    Correct, iv been thinking would a bad wheel sensor be triggering the anti locks just enough to dim the lights ?

  9. #9

    Default

    Anti locks should not be dimming the lights. You might have an internal problem in the ABS computer that is overloading the electrical.
    Pull the ABS fuse, see if the problem goes away.

    And a note, a bad wheel sensor will normally turn off the ABS

  10. #10

    Default

    Had the whole ABS computer replaced cost me $600 installed and it did it before and after

Page 1 of 2 12 Last Post byLast Post by

Similar Threads

  1. Dash lights "dimming" and other odd electrical issues
    By Bowtied in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 4
    Last: 02-01-2013, 03:46 PM
  2. Head lights ? What head lights ? What happened to my head lights ....
    By DOBERDEWD in forum Chevy Tahoe Forum (GMC Yukon, Cadillac Escalade)
    Replies: 2
    Last: 12-31-2011, 08:35 PM
  3. Low Voltage, Dimming lights.
    By 03HeavyHalf in forum GM Electrical Tech
    Replies: 5
    Last: 02-21-2011, 09:45 AM
  4. Dimming head lights?
    By s5belford in forum General Chevy & GM Tech Questions
    Replies: 10
    Last: 12-10-2009, 10:09 PM
  5. Dimming Dash Lights
    By MeanGreenMachine in forum General Chevy & GM Tech Questions
    Replies: 16
    Last: 07-13-2009, 02:12 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •