[Abnormal headlight dimming]

Not really maybe half way to 3/4's I don't like to bug people with it but the battery under the hood is just your typical walmart special, it's just annoying driving down the highway at night and having your lights dimming and the dash lights dimming like crazy.

[Abnormal headlight dimming]

Hmm well since my batteries only 6 months old should I use the warranty? And next pay check I'll get some 0 gauge for big 3, and maybe a second batt with 0 gauge ran to it, who would've thought electrical would be so important at 500 watts rms lol.

[Abnormal headlight dimming]

So you think that could be causing it even though the voltage isn't dropping that bad?

[Abnormal headlight dimming]

Also Did same test at about 2.5krpm which is about 60 when cruising and the voltage is about .2 higher when the bass is hitting and lights dim just as bad.

[Abnormal headlight dimming]

So I drive an 03 focus, have grounds done in 4 gauge the alternator wire is still 8 gauge... but regardless my car idles at about 14.12~14.27. However when the bass hits my headlights dim and all interor lights dim bad. So I think well my voltage must be dropping maybe I have a bad ground or I need to upgrade my charging wire. Amp is an alpine mrp 500 pushing 2 4 ohms subs wired to 2 ohms. Amp suggest 8 gauge I used 4 gauge, check voltage at amp only about ~.1 less than at batt. When the bass hits the voltage at the battery never drops below 12.9 and at the amp to maybe 12.7 or 6. Is this normal? Thanks in advance if you need more info let me know.