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<blockquote data-quote="grandam888" data-source="post: 7382889" data-attributes="member: 628519">well i would say it should be enough. i would check all power connections to be sure they are all tight and good. i see you had the same issues with both batteries, and its coming and going for no reason. could be a loose connection under the hood. and if your constantly dropping into the low tens voltage wise, i would calm down on the volume as you could possibly blow the amp from under voltage.and red tops are for starting, you would need a yellow top, but the red will&quot;work&quot;. personally i would bring it back and get a yellow top, put the old battery back under the hood, and run the yellow top in the back.if your alternator is causing you fits, the battery may make up for the amperage you don&#039;t have. also a 1200 watt amp should use about 90 amps of current. 40 % of your alternator is most likely being used by the cars systems and etc, so that&#039;s about 50 amps, leaving you 70 amps for your car audio. you can see @ peak amperage draw you don&#039;t have enough without a second battery, and i really wouldn&#039;t rely on the starting battery to make up the amperage you don&#039;t have.so, either bring back the red top, and put the yellow in back, or put old battery under hood, and red top in back. if all of the above doesn&#039;t help, upgrade to a larger alternator. and check all wiring connections including alt to battery etc to see if they are loose.</blockquote>

[QUOTE="grandam888, post: 7382889, member: 628519"] well i would say it should be enough. i would check all power connections to be sure they are all tight and good. i see you had the same issues with both batteries, and its coming and going for no reason. could be a loose connection under the hood. and if your constantly dropping into the low tens voltage wise, i would calm down on the volume as you could possibly blow the amp from under voltage. and red tops are for starting, you would need a yellow top, but the red will"work". personally i would bring it back and get a yellow top, put the old battery back under the hood, and run the yellow top in the back. if your alternator is causing you fits, the battery may make up for the amperage you don't have. also a 1200 watt amp should use about 90 amps of current. 40 % of your alternator is most likely being used by the cars systems and etc, so that's about 50 amps, leaving you 70 amps for your car audio. you can see @ peak amperage draw you don't have enough without a second battery, and i really wouldn't rely on the starting battery to make up the amperage you don't have. so, either bring back the red top, and put the yellow in back, or put old battery under hood, and red top in back. if all of the above doesn't help, upgrade to a larger alternator. and check all wiring connections including alt to battery etc to see if they are loose. [/QUOTE]

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