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Message: <blockquote data-quote="dragon.breath" data-source="post: 7187612" data-attributes="member: 582656">to the OP.you need to do 'the big 3 '.if you still have the yellow top you pulled out of your car, install it in the trunk next to the amplifier. if you still have voltage drops below 12.5 volts after doing that you will need to look at a H.O. alt.i really think with the big 3 and two batteries you should be good to go. in my car, i have two 35/75 yellow tops, the big 3, and a factory 85 amp alternator. with 1900 watts rms of power my voltage never goes below 13.0v</blockquote>

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