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Im running 400rms to my battery currently for my door speakers, im getting 2 12" 1000rms subs so i will be pushing 2k rms. What size second battery do i need and what size altanator do i need to upgrade to? also is there anything i need to know when hooking up a dual battery to an altenator or is it just hookup and play without draining power from main that powers the truck?
 

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You need to figure out amp draw on all your accessories and size the alternator accordingly. You can use duel batteries but there are a few different ways use can use them. Parallel or use a battery isolator. Use of a capacitor (or two) can help instant power draw such as hard hitting base drums is another option depending on your set up. Check out the link below, Wealth of info there.





http://www.crutchfield.com/S-Kz0bor5swNP/learn/learningcenter/car/amplifiers_faq.html
 
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