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Gmc Repair Questions

Headlights Dimming 2014 Gmc Sierra 1500

Car Model: 2014 Gmc Sierra 1500 Submitted on April 8, 2016


Why do my headlights dim when I have my AC and stereo on? 

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  • jason
    (0) Rated this answer helpful
    Sounds like you may have a charging system issue. You should have the charging system tested. Your alternator may not be able to keep up with the demand of your accessories (stereo, lights, ect...)
    Posted on April 09, 2016
    • Jon
      (0) Rated this answer helpful
      The headlights are dimming because there is not enough voltage to power all of these major accessories in your vehicle. The alternator will be working in excess of what it is designed to do because your battery most likely needs to be charged or replaced. If your battery is tested at less than 12.6 volts it will eventually cause other components of your vehicle electrical system to fail. There are less common reasons but CharacterLimit reached??
      Posted on April 08, 2016

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