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installing a 2nd battery

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=27164
Printed Date: August 20, 2025 at 6:45 PM


Topic: installing a 2nd battery

Posted By: Clean Install
Subject: installing a 2nd battery
Date Posted: February 24, 2004 at 9:10 PM

A friend of mine is in the process of buying a dry cell battery for his car....he was told that this would help his orginal battery and alternator....

He plans to run 2 12 fusion power plants along with 2 punch hx2....if I am correct the fusions are on about a 1000 watt fusion amp possible 1200....and the rockfords are running on a rockford 800 somethings which I believe is about 600 or 800 by 2 (dont quote me on the power supply all I know is that its alot of power )

His ride is a newer ford tarus (?sp?) 99-00 or so...he had to about a month ago, go and purchase a new alternator (factory).....I told him then to think about a bigger alt., cause even then he wanted to buy 2 other twelves not the rockford hx2s.....

also I am not aware of the factory alt. output........but I feel that with this new setup that he will be running....it will exceed the 120% of the output...which will cause damage to the alt and bat. correct...?

I told him that I am not sure on how to install a second battery, I have never done this...but I did not think that he can run wires like he plans to..(going to run wires from the orginal battery to the new dry cell (which is only a 60.00 dollar battery " I thought that was a little cheap not sure what brand")

Do you guys feel that he needs to first upgrade is alt. or will just the new Dry Cell, really help without a larger alt. ?

I thought that it would still be taking more power to run these two batterys....I am not for sure thats why I wanted to ask you guys.....

And thats not the correct way to install a second battery or is it....(would you not need a battery isolator??????)

hes doing this on friday......so any help would be great...cause I am not sure if I am correct....I feel some what like I am just not hitting (the nail with the hammer) if you know what I mean.....

Thanks Doug



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If we learn from each success and
each failure, then we can improve ourselves



Replies:

Posted By: customsuburb
Date Posted: February 25, 2004 at 8:28 AM
No a second battery will not help you much, unless you want to listen to your music longer with the car off. He will definitely need a high output alternator if he plans on running a big amp like this. The only thing a second battery will do for you without a high output alternator is create another load for your alternator to charge. If he trys to run that big of an amp on just a regular factory alternator he is going to get a severe drop in performance.




Posted By: Clean Install
Date Posted: February 27, 2004 at 7:26 PM

where would be a good place to pick up a HO alt.?

also If I might add.....has anyone had trouble with putting in a HO alt for a civic...I read in a post somewhere that a guy had some wire trouble or something....Just curious if anyone has had any trouble thanks again

Doug



-------------
If we learn from each success and
each failure, then we can improve ourselves




Posted By: Ravendarat
Date Posted: February 27, 2004 at 7:35 PM
putting a high output altenator on a civic is retty strait forward. You can get bolt ons that are like 150 amp and the wiring is really simple.




Posted By: Clean Install
Date Posted: February 27, 2004 at 7:52 PM

great thanks for the reply....no real trouble though....thats good to hear :-)



-------------
If we learn from each success and
each failure, then we can improve ourselves





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