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how to wire two batteries and a cap

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=76625
Printed Date: May 14, 2024 at 11:16 PM


Topic: how to wire two batteries and a cap

Posted By: extrmndor3
Subject: how to wire two batteries and a cap
Date Posted: April 22, 2006 at 3:32 PM

i have a red top batterie that im running for startin and i have a the batterie than im replacin and they both have the same crakin amps and cold crakin amps and i have a 3.2 cap  and i need to know how to wire thse tree to have the most out of my electrical system

can i put  a redtop then a big thick wire to my ol batterie then grounded and then to the cap close to the amps or

red top to the cap close to the second batteries then to the amps  .

1 redtop-ol batterie-cap-amps

2 redtop- cap- ol batterie-amps

wich one is the best set up



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lilrob



Replies:

Posted By: stevdart
Date Posted: April 22, 2006 at 4:08 PM
Cap goes directly before the amplifier you're using for the sub.  If both batteries were the same type and age you could wire them in parallel without an isolator between.  But when using one new and the other older you should isolate them for longest-lasting battery life.  Lowest cost solution is to use two new batteries that are identical and use the older battery for another car.  Battery - battery - cap - amplifier.  Ground everything to chassis for negative return and upgrade the front battery-to-chassis cable to at least the gauge of the power wire.  Fuses go at the front battery and just before the rear battery, then fuse after the rear battery as well.  Fuse size is determined by wire gauge.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.




Posted By: haemphyst
Date Posted: April 22, 2006 at 4:09 PM
It won't matter, as your batteries are different types of batteries. To be done correctly, they need to be THE SAME battery, not just the same CCAs. It CAN be done with different battery types, but you MUST use an isolator, and I am VERY STRONGLY AGAINST isolators. Get rid of the old battery, wire all three in parallel, and be done with it.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."




Posted By: extrmndor3
Date Posted: April 22, 2006 at 5:57 PM
ok wat if i use the ol batterie for just temporary and the cap must be before the amp  right i was thinkin to put the cap before the secon batterie cuz the batterie is going to discharge andcharge again wit the amp so the cap have the abillity to discharge faster than a batterie and i think that will make my second batterie run wit out a problems

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lilrob




Posted By: jeffchilcott
Date Posted: April 23, 2006 at 4:17 PM
Just a thought....the caps and batteries will do you no good but to kill your alternator faster if it is not properly upgraded.    What size alternator do you have?


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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place





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