Lights dimming in truck

[truspector 10+ year member]

Lights are dimming in my truck on big notes, which surprises me considering I'm only pushing 400 watts. Should I look into a new battery (just replaced about six months ago), new alternator, or (/shudders) a capacitor (really think this would be a waste at my power level). //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

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[BeAlLsTaR13 10+ year member]

capacitor will be a waste at any power level

if its only 400rms, just do a big three upgrade and it should fix the problem