help with second battery

[Bomtillington]

hi guys i wanted to run a agm in the trunk along with the lead acid one i have under the hood is this possible what would i need to do

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[phemps 10+ year member]

You dont want to mix battery types, your going to significantly shorten battery life

 

[mlstrass 5,000+ posts]

1/0 wire, fused at BOTH ends for POS run. Ground in back...done

 

[Full Tilt 10+ year member]

Let me google that for you

Here ya' go, sport.

 

[phemps 10+ year member]

unless you get an isolator. which i personally was never into

 

[Bomtillington]

so if i use an isolator ill be all set?

 

[Bassman999 10+ year member]

Isolator separates them.

In my understanding that gives you a start batt and an amp batt...no benefit to the amps of having 2 though.

Alt charges which ever isolator tells it to.

 

[Bomtillington]

my understanding was that when isolator remote is off batterys are seperate when relat is triggered the two batteries become one battery

 

[Nutdawg651]

^^^ no when car is of the batteries seperate yes but the isolater tells the rear battery to turn on which runs everything in your car including your amps as soon as you turn the car on the isolator tells it to switch to the starter which will start your car and run everything then while its charging now im not sure but a friend told me that when the starter battery fully charges it switches over to charge your battery in the trunk and when thats charged it switches backuntil you turn the key off in which the process starts all over again i had my starter bettery up front with my stock alt , an isolator ground,remote,zero gauge fused to the starter battery and a 17 foot run to the trunk fused at both ends on a kinetik 1400 grounded to the trunk without even having to do the big 3 on 3 12 inch l7s and a zx 2500 no dimming worked perfect pure power

 

[Bomtillington]

i dont understand what you meant in your explanation of how you hooked it up

 

[Bomtillington]

wtf is that

an isolator ground,remote,

 

[phemps 10+ year member]

When you use an isolator both banks of batteries will be charged together, but the banks will not interact with each other so for example you would be able to play your system with the car off but the upfront battery will not be affected by the discharging

 

[Bomtillington]

so how would i get the two batteries to work together?

 

---------- Post added at 03:43 AM ---------- Previous post was at 03:43 AM ----------

 

i have three different size agm batteries for the trunk and the lead acid for the starter?

 

[black05alti]

Why not just get agm for your underhood batt too?

 

[phemps 10+ year member]

Why not just get agm for your underhood batt too?

I would suggest this as well, but id also like to add that just because theyre all agm doesnt mean they wont affect each others longevity if they arent the same exact brand, age. but as far as hooking it all up that wont be terribly hard the isolator will have instructions..