extra battery

[TheBaron929 10+ year member]

i've got some general questions, sorry if i sound like a dumbass, i'm not an expert on car audio by any means, and just want to clear up certain things....

i plan on using an extra battery in my trunk to power my amplifier. i just want to make sure i've got everything correct w/ the setup.

1st. i have to ground the NEGATIVE of the battery wherever i would normally ground the amp?

2nd the POSITIVE on the battery doesn't have to be connected anywhere else does it, it just supplies power?

3rd when connecting the amplifier, i can connect the power to the POSITIVE as normal - can i ground the amplifier by connecting it to the NEGATIVE of the battery?

sorry if all these questions are stupid, and sorry if i answered them all myself, i just want to make sure i'm not getting anything wrong.

also if anyone has any better suggestions, or things i should know about when attempting this setup please let me know.

Thanks

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[2loud4u 10+ year member]

That was my old set up.

Just run your + and - to the amp off the rear battery as well. not in picture.

 

[audiolife 5,000+ posts]

http://www.kinetikaudio.com/manuals/khccells.pdf page 8 the diagram he made is correct .

 

[TheBaron929 10+ year member]

thanks guys, what gauge wiring do you recommend between the batteries? i know i'm currently running 4 AWG from the main batter to a splitter between my amps, should i use larger gauge or does it really matter?

 

[2loud4u 10+ year member]

http://www.kinetikaudio.com/manuals/khccells.pdf page 8 the diagram he made is correct .

Page 8 is a better pic like he said but same as mine just better lol

Only thing missing in the pic below is that rear battery should be grounded.

 

[audiolife 5,000+ posts]

thanks guys, what gauge wiring do you recommend between the batteries? i know i'm currently running 4 AWG from the main batter to a splitter between my amps, should i use larger gauge or does it really matter?

0 ga between batts

 

[TheBaron929 10+ year member]

awesome, thanks again

 

[Team Hammer 10+ year member]

I would add that picture has no Fuse from the Rear battery to amp. I would use a MANL fused dist. Block to each amp.

 

[jchancellortool 10+ year member]

Page 8 is a better pic like he said but same as mine just better lolOnly thing missing in the pic below is that rear battery should be grounded.

Not to steal the thread but i have a question pertaining to this. Does this mean if the car battery is a different kind than the battery in the trunk, no isolator is required. I thought that they were necessary in this kind of situation.

 

[2loud4u 10+ year member]

Not to steal the thread but i have a question pertaining to this. Does this mean if the car battery is a different kind than the battery in the trunk, no isolator is required. I thought that they were necessary in this kind of situation.

No you really dont need a isolator unless you want to play your system while the car is not running.

 

[jchancellortool 10+ year member]

So could i just hook the battery in the trunk up straight up to the alternator?

 

[helotaxi 5,000+ posts]

Page 8 is a better pic like he said but same as mine just better lolOnly thing missing in the pic below is that rear battery should be grounded.

It is grounded, right back to the front battery.

 

[Puggsley456 10+ year member]

Please forgive my ignorance.....but why do you need to run the ground from the front battery to the back one? Cant you just ground close to the rear battery and also just ground the amp? That way you only need to run the power wire between the batteries?

 

[iceteebone 5,000+ posts]

Please forgive my ignorance.....butbut why do you need to run the ground from the front battery to the back one? Cant you just ground close to the rear battery and also just ground the amp? That way you only need to run the power wire between the batteries?

you don't Need to ground back to the front battery. its been debated whether it is necessary or not.

 

[audiolife 5,000+ posts]

grounding to the battery definately works grounding in back may work as good or lesser or even not at all....