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    Lights dimming, voltage sinking

    Hey everyone new guy here. First time owning a GMC/Chevy, normally I buy Fords.. I have a 2011 GMC Yukon XL 1500 6.2L Denali I've noticed the voltage goes down a lot when I'm at a light or if the music/bass is going. Lights dim, dash lights dim, etc. So far I have replaced the battery...

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