tieing two batterys together
 

i need some info on tieing batterys together

im installin a system on a guys boat and cant find a good place for a ------- ground that isnt 15 feet away, and he has a spare battery over by where the amp and sub will be, so i figured i could tie the two together and get a good ground off the battery

what do you guys think? ------ fiberglass is a bitch to find a place to ground on

sorry mods if this is in the wrong place, didnt know where to put it

Re: tieing two batterys together
 

i wouldnt tie both batterys together because unless they are the same age/size/type/brand they might discharge eachother. You can use a battery isolator but id just get 2 of the same batteries or get a bigger one

Re: tieing two batterys together
 

the problem isnt power, its finding a ground for the amp

the batterys are the same size, and approximately the same age, i honestly dont think brand has much to do with anything

i just need ideas to find a good ground for this amp besides haveing to run a ground wire thats 15 feet long

Re: tieing two batterys together
 

so you just want to tie both battery grounds together?

Re: tieing two batterys together
 

i want to be able to use the ground terminal on the battery up front while its tied to the one in the back basicly so i have a nice ground for the amp

Re: tieing two batterys together
 

that should be fine

Re: tieing two batterys together
 

how do i need to wire the terminals? positive to positive and ground on the chassis or some other way?

Re: tieing two batterys together
 

you might wana get an expert opinion on this... isn't something i would want to skimp out on.

however it seems like you want to connect two batteries together... what's the need to connect the terminals? Just source the ground for battery A and share that with battery B [either by the ground point, or splicing the ground wire]. There seems to be no point in connecting the positive and negatives of the two batteries together especially since you say there is no issue with power [which would seem to be the only reason you would want to connect two batteries together to run in series for some more juice].

Again no expert here

Re: tieing two batterys together
 

just get a really long cable and connect it to your boat trailer. Then it'll look like a really big remote control boat. Ghetto style even with the cord still. 8)

Re: tieing two batterys together
 

If you run 2 batteries together in series its going to have 12 cells @ 2.15v a cell, you're going to be pushing 25.5v through the system and you'll fry your ----.

just run a thicker gauge ground wire back to something you can ground on.

Re: tieing two batterys together
 

if i run a ground wire to anywhere i can get a decent ground, its going to be 18 feet 6 inchs long, and cost the guy an extra $40 or more for wire

i wanted to wire the batterys in series cause i have the power wire to the front already, and could just connect it to that other battery, and i have enough extra for a short power and ground wire for the amp

im tryin to save the guy some money and eliminate my headache of trying to find a good ground, cause its practicly ------ impossible in this thing

Re: tieing two batterys together
 

Ok, 40 for a wire, or how much for a new sound system?

just looked up the price of the wire, its like 12 dollars for 20 feet of 4g

Re: tieing two batterys together
 

$2 per foot for 8 gauge here

but thats a nice guess

i've done enough stereos to know too much juice can fry ----, and i've also done enough to know a ground wire longer then a foot isnt very desirable

what can i do that doesnt require an 18 foot ground?

Re: tieing two batterys together
 

relocate the battery, get a big ass piece of metal, or ground to the water :X

Re: tieing two batterys together
 

i can get a piece of metal, but what do i do... just let it chill in the back and ground to it, or do i need to mount it to somethin?

i've never had to work on a boat before so this is a new one for me

Re: tieing two batterys together
 

Holly hell i can't beilive this is going on for now...15 post ..and no one has said this..


you must run the negitive and postive on the same battery..it's a RULE ... being DC...

weither it be you have to batteries wired parallel, or using a single battery,

two batterys...one for the amp one for the motor ...fine ...altho you must charge the battery for the amp...using a wire...that's the right size for the amp. Draw.... 500 watts at 12V = 41 Amps = 4 gauge wire...

Don't you guys have a wal mart near there ?! i bought a 1400 watt amp kit.. for 35 $ 5 guage like 18 feet of it or so....

it's easyer to run another cable for the amp wiring alone.....than it is to run dual batterys and amp wiring... PLUS ...one dies...they both die.. Good luck

Re: tieing two batterys together
 

i didnt say i was going to run just the ground off of that battery douche bag

yes i have a walmart, and its $40 for a 8 gauge amp kit

i didnt ask what you thought was easier, and im not running an 18 foot ------- ground wire

i've already decided where to ground too though so feel free to ignore this thread

Re: tieing two batterys together
 

I bought an 8 gauge kit yesterday, its 24 dollars or some ----.

Re: tieing two batterys together
 

38.95 plus tax here pretty much brings it to $40

i dont care what it is there, buy it and ship it to me if you want to dispute prices i can go take a picture of the damn tag

where i lived before here i could get it for like $15 for almost 25 feet, but then i moved and prices became gay