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Well..... you DONT need a 2nd alternator for a 2nd battery, I used to have bass comp set up and ran a 2nd battery and NEVER had to add a second alternator for it, now if i had more then just the second battery then i would have to add one or more. BUT that also depends on your current alternators output and you can always put a better output alternator in instead of adding a second one. BUT its much better then just using caps alone. I had an issue with killing my main battery with caps alone in my old vehicle, but with a second battery installed i never had an issue and the bass was alot cleaner. But then again, if you are not running that much power then its no big deal. I was pushing 1600 watts out of one amp (in mono) and 800x4 in the other amp.
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