How to fix headlight dimming issues on 2007 chevy tahoe

Asked by Nov 13, 2014 at 11:20 AM about the 2007 Chevrolet Tahoe LS 2WD

Question type: General

i have a 2007 chevy tahoe 5.3L flex fuel ls model 2wd and i am having some headlight
dimming issues .  i have replaced both battery wires and put a new alt and battery and
still at night just rolling up the windows will make the headlights dim a little .  i added a
after market stereo system and anytime the bass hits the lights dim really bad  it says
that the truck alt is 160 amp do i need to upgrade and get a high output alt or is there
some kind of grounding issues that these trucks are having i also added a second
battery and isolator and  1/0 wiring for both batterys grounds and positives  just for the
car audio and still have the same problem   i noticed the issue before adding any car
audio can anyone help me that has had the same problem and how to fix it thanks

1 Answer


Every car will dim the lights if you roll the windows up. Especially if you try to roll up a window that is already up. It's an amp draw, there isn't a way around it unless you get manual windows or design a more efficient electric motor. Maybe you need to add a capacitor for the aftermarket amp. That will help with the bass hitting.

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