should i upgrade to 1/0 gauge to back battery or no?

[mscott1979 10+ year member]

hey guys i have 2 batteries in my car with the big 3 upgrade. red top in front and yellow top out back both grounded to chassis. right now im running 1/0 to the front red top and distributing off the front to the back battery with 4 gauge. my question is should i run 1/0 to the back instead of the front which i just use as a starting battery or is it sufficient the way it is now. I dont have a isolater in my car.

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[GLN305 10+ year member]

If you don't have an isolator in your car, you are using both batteries as starting batteries together. 4 gauge is pretty small for a long run that can draw decent current. I would run some 1/0.

 

[mscott1979 10+ year member]

that was wat i was thinking, it dawned on me this morning while i was in the shower-lol. Instead of using an isolater couldnt i run the back battery directly off the output terminal of the alternator and run the front using a seperate connection to the same alternator, would that seperate the two?

 

[sacsking916 5,000+ posts]

that was wat i was thinking, it dawned on me this morning while i was in the shower-lol. Instead of using an isolater couldnt i run the back battery directly off the output terminal of the alternator and run the front using a seperate connection to the same alternator, would that seperate the two?

only way to seperate the 2 is with a isolator.

 

[mscott1979 10+ year member]

ok isolater it is then.....about wat size do i need i have a aq 2200d and a aq 4x90

 

[mscott1979 10+ year member]

also would running the 0/1 gauge directly from the output on the alt. be any different than daisy chaining it off the front battery or would the voltage be the same regardless?

 

[mscott1979 10+ year member]

anybody got any suggestions?