Confused About Trunk Battery

[JHardee 10+ year member]

my bad if theres already posts about this but i tryed searching and came up with nothing. so i plan on adding a Stinger sp70 in the trunk and i have no idea how to wire it? like is it from the battery up front all the way to back or is there another way of going about it, i want my car to charge both the batteries, idw have to charge them seperatly. and besides 1/0 gauge wire do i need to buy anyhing else to be able to connect the batterys??

thank you

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[revrider1 5,000+ posts]

Positive from front battery to rear battery, then to amps positive. Ground dont have to be ran, just amp to rear battery.

 

[99grandprixGT 5,000+ posts]

ya wire in parrell with your front battery. + from front battery to the + on rear battery. fuse 18 inches from front battery and 18 inches from rear battery. also you can run the - from the front to the - on the back. some people just ground the rear battery in the back rather than run all the way back up to front battery.

 

[loopkiller 10+ year member]

 

[rc10mike 10+ year member]

So the best way to ground a rear batt is to run a ground wire all the way up to the front batt. AND ground in the trunk also?

 

[loopkiller 10+ year member]

So the best way to ground a rear batt is to run a ground wire all the way up to the front batt. AND ground in the trunk also?

The extra ground to chassis in the trunk is not 100% necessary, but I like to think of it as a backup ground. It will likely never be used by your system, unless there is an issue with the main ground wire between the batteries. It just does not hurt anything either. So if it makes your setup messy, or you just can't spare an extra foot of wire, that is the one wire you can leave out of the image above.

 

[JHardee 10+ year member]

alright well not to sound stupid but, how big of fuses do i need? and what kind? like anl ones?

 

[bball09124 10+ year member]

alright well not to sound stupid but, how big of fuses do i need? and what kind? like anl ones?

You fuse based on how much current your wire can carry. If it's 0 awg, you can use either a 250 or 300 amp ANL fuse.