Hook Up Two Batteries

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D2005l

Member - Posts: 9

Joined: March 12, 2004

Location: United States

Posted: November 10, 2004 at 7:32 PM / IP Logged

How do i hook up a additional battery in my trunk for my system?

jeffchilcott

Platinum - Posts: 2,483

Joined: April 11, 2002

Location: United States

Posted: November 10, 2004 at 7:38 PM / IP Logged

using a battery isolator you will be able to charge and maintain the second battery off the alternator. What makes you think you need a second battery? Have you already upgraded your alternator? If you havent then you will probably just add to the problem by adding a second battery to charge. The first step to gaining power is the source, which is not your battery its your alternator

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chevyman26

Copper - Posts: 227

Joined: April 14, 2004

Location: United States

Posted: November 11, 2004 at 1:09 AM / IP Logged

jeffchilcott wrote:

Sound advice, however - I would just like to add that an isolater will only be needed if you play your system a lot with the car off. Otherwise, just hooking the batteries up in parallel with each other would be the best (and cheapest) way to go. But as jeff said - it will only add to the problem if the alt. isn't suffiecient for your stereo.

You'd better get me out of this lord... or else you'll have me to deal with. -- Hunter S. Thompson "F.A.L.I.L.V."

amador

Copper - Posts: 108

Joined: August 08, 2002

Location: United States

Posted: November 11, 2004 at 1:37 AM / IP Logged

if you want to hook up a battery without a isolator this is what you need to do run your power wire to the back then to a cap from the cap you will go to second battery from the second battey to the amps this works and is proven this is the cheapest way and like i said it works

chevyman26

Copper - Posts: 227

Joined: April 14, 2004

Location: United States

Posted: November 11, 2004 at 8:14 AM / IP Logged

It will also work just as fine to just run a cable directly from one's positive post to the other's, and run both grounds to the frame. Even cheaper. No need for a cap, unless you already have one. ONE THING, however, which I forgot to mention last night - make sure that the batteries are the same make, model, and capacity. Ideally, you would want to use two identical brand new batteries, but as long as you haven't ever (EVER) had your "regular" batt. discharged, it would Probably be ok to add another identical batt. to it.

You'd better get me out of this lord... or else you'll have me to deal with. -- Hunter S. Thompson "F.A.L.I.L.V."

chevyman26

Copper - Posts: 227

Joined: April 14, 2004

Location: United States

Posted: November 11, 2004 at 8:23 AM / IP Logged

amador wrote:

amador - could you explain to me the reasoning behing putting the cap. in between the batteries, as opposed to between the battery and amp where it should be? I am not a car audio expert (but not a slouch either), but I am educated(college), trained, and experienced with car repair, including electrical systems, and I am sitting here scratching my head saying "what tha? Why?"

If it weren't for my horse, I would have never spent that year at college.

You'd better get me out of this lord... or else you'll have me to deal with. -- Hunter S. Thompson "F.A.L.I.L.V."

dragonrage

Copper - Posts: 193

Joined: March 15, 2003

Location: United States

Posted: November 13, 2004 at 10:33 PM / IP Logged

"if you want to hook up a battery without a isolator this is what you need to do run your power wire to the back then to a cap from the cap you will go to second battery from the second battey to the amps this works and is proven this is the cheapest way and like i said it works"

Absolutely not. Capacitors go in parallel with the 12V, and it does not matter where a component in parallel is located. You can use a relay (well, probably more like several in parallel) or a switch or some very high current diodes.

You should NEVER add a battery unless it's only for using the system with the car off. Your battery should never get touched by your cars electrical system when the car runs except to charge it. If it does, then the alternator is not good enough.

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Hook Up Two Batteries

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