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<blockquote data-quote="SomeDonnieDude" data-source="post: 6099651" data-attributes="member: 586009">What vehicle do you have? I would either do a HO alt with upgraded battery under the hood. OR upgrade the batt under the hood and add a second in the rear.&nbsp; Go with the biggest you can under the hood, and if you need a second one grab another identical one.&nbsp; Make sure to fuse right before and after that battery in the trunk as well (if you get one).&nbsp; I would do the big 3 under the hood. You will need to do it regardless if you get a HO alt.You do not need an isolator if the batteries are identical.&nbsp; Also HO alt&#039;s will not fry your Head Unit:laugh:&nbsp; And don&#039;t go with Optima.&nbsp; There are much better batteries on the market for the money.You are correct, low voltage will harm your amp.&nbsp; If you don&#039;t upgrade your electrical, you will kill that amp.&nbsp; A single run of quality 1/0 gauge wire will be perfect.Do not choose your fuse size for power wire according to your amp, fuse it according to how much current the wire can handle safely.</blockquote>

[QUOTE="SomeDonnieDude, post: 6099651, member: 586009"] What vehicle do you have? I would either do a HO alt with upgraded battery under the hood. OR upgrade the batt under the hood and add a second in the rear. Go with the biggest you can under the hood, and if you need a second one grab another identical one. Make sure to fuse right before and after that battery in the trunk as well (if you get one). I would do the big 3 under the hood. You will need to do it regardless if you get a HO alt. You do not need an isolator if the batteries are identical. Also HO alt's will not fry your Head Unit:laugh: And don't go with Optima. There are much better batteries on the market for the money. You are correct, low voltage will harm your amp. If you don't upgrade your electrical, you will kill that amp. A single run of quality 1/0 gauge wire will be perfect. [B]Do not choose your fuse size for power wire according to your amp, fuse it according to how much current the wire can handle safely[/B]. [/QUOTE]

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