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<blockquote data-quote="jrwalte" data-source="post: 3722133" data-attributes="member: 584454">I&#039;m about to install a system into my just purchased 2007 Corolla.&nbsp; The corolla&#039;s alternator is rated at 80A.&nbsp; It still has the factory battery with 520A cold crank rating (if that measurement matters).I&#039;m going to be using 2 amps.<a href="http://inform3.kenwoodusa.com/manuals/kac746.pdf" target="_blank">Kenwood KAC 746</a> bridged at 4-ohm 100RMS per channel.As yet to be purchased class-D mono 4-ohm ~400RMS sub amp.I plan on running a single power line to the trunk and then running a distribution block to each amp.&nbsp; What is the guage wire I should use from the battery to the trunk for apprx max wattage of 1000, 500 RMS?Also, how should I ground the wire? Since I may have to install a cap (which I&#039;d place in the trunk), should I run a ground wire from the battery or is grounding in the trunk OK? Also, does the ground need to be the same guage as the power or one size smaller? Example, if I use 4 guage power is 8 guage ground OK?First thing I&#039;ll do is &#039;the big three&#039; and then test the system as-is before considering a capacitor.&nbsp; Do any of you feel one would be necessary?&nbsp; If I find I do need one, what farad should I look at? 2? 5?I also plan on replacing the battery...but I&#039;m going to let the system drain and kill the currently 1 year old one before spending $170 on a red top Optima.</blockquote>

[QUOTE="jrwalte, post: 3722133, member: 584454"] I'm about to install a system into my just purchased 2007 Corolla. The corolla's alternator is rated at 80A. It still has the factory battery with 520A cold crank rating (if that measurement matters). I'm going to be using 2 amps. [URL="http://inform3.kenwoodusa.com/manuals/kac746.pdf"]Kenwood KAC 746[/URL] bridged at 4-ohm 100RMS per channel. As yet to be purchased class-D mono 4-ohm ~400RMS sub amp. I plan on running a single power line to the trunk and then running a distribution block to each amp. What is the guage wire I should use from the battery to the trunk for apprx max wattage of 1000, 500 RMS? Also, how should I ground the wire? Since I may have to install a cap (which I'd place in the trunk), should I run a ground wire from the battery or is grounding in the trunk OK? Also, does the ground need to be the same guage as the power or one size smaller? Example, if I use 4 guage power is 8 guage ground OK? First thing I'll do is 'the big three' and then test the system as-is before considering a capacitor. Do any of you feel one would be necessary? If I find I do need one, what farad should I look at? 2? 5? I also plan on replacing the battery...but I'm going to let the system drain and kill the currently 1 year old one before spending $170 on a red top Optima. [/QUOTE]

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