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<blockquote data-quote="drkodin" data-source="post: 1293140" data-attributes="member: 545032">no real need for a high output alt OR a second battery with only 1700W, but if you are still wanting one or the other dont even consider the alt.A second battery will allow a larger &quot;bank&quot; of current for the amps to tap into, and your 80a alt shouldn&#039;t have a problem keeping the charge on the batteries since you are only playing music.&nbsp; A higher output alt can be beneficial in the right setup/install, but they cost more than a battery and quite frankly aren&#039;t required for anything under 3kW.I would suggest, if you dont have one already, to start with a single yellowtop under your hood and see how it works.&nbsp; Also be sure to upgrade the 3 wires under your hood:Alt+ to Batt+Batt- to ChassisChassis to Engine BlockAfter that is done, if you still have issues grab a second yellow of the same make/model and throw it in your trunk.&nbsp; As long as the batteries match, and you aren&#039;t planning on running the system with the car off for prolonged periods of time then there is no need for an isolator, so just wire the two batt+ together and ground the trunk batt to the chassis and you should be set.I personally run 3kW on music with 2 yellows, and granted a 150a alt (stock), but without the 3 wires upgraded and I dont have any dimming issues at all, even at full tilt.</blockquote>

[QUOTE="drkodin, post: 1293140, member: 545032"] no real need for a high output alt OR a second battery with only 1700W, but if you are still wanting one or the other dont even consider the alt. A second battery will allow a larger "bank" of current for the amps to tap into, and your 80a alt shouldn't have a problem keeping the charge on the batteries since you are only playing music. A higher output alt can be beneficial in the right setup/install, but they cost more than a battery and quite frankly aren't required for anything under 3kW. I would suggest, if you dont have one already, to start with a single yellowtop under your hood and see how it works. Also be sure to upgrade the 3 wires under your hood: Alt+ to Batt+ Batt- to Chassis Chassis to Engine Block After that is done, if you still have issues grab a second yellow of the same make/model and throw it in your trunk. As long as the batteries match, and you aren't planning on running the system with the car off for prolonged periods of time then there is no need for an isolator, so just wire the two batt+ together and ground the trunk batt to the chassis and you should be set. I personally run 3kW on music with 2 yellows, and granted a 150a alt (stock), but without the 3 wires upgraded and I dont have any dimming issues at all, even at full tilt. [/QUOTE]

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