two runs. 1 + and 1 - or two runs pos gnd in trunk?

[muskyhunter567 10+ year member]

i have two runs of 1/0 gauge going to a single rear battery from the front. one pos and one neg. i drive a 2001 impala a unibody car, and i cant find a good ground in the trunk, if i wanted to could i run two runs of pos and ground in the trunk with two grounds? do you think i would get a voltage gain? or say lower voltage drops? what do you guys think?

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[Supergumby5000 5,000+ posts]

with the setup in your sig, i would stick with 1 pos, 1 neg, battery to battery connections.

 

[muskyhunter567 10+ year member]

what makes you say that? what if i were to say switch to 4k rms and 2-3 batts in the back?

 

[Supergumby5000 5,000+ posts]

i run 4k with 2 batts in the back, and i have one pos, one neg.

the path of least resistance is the best.

 

[01 S 10 10+ year member]

i run 4k with 2 batts in the back, and i have one pos, one neg.
the path of least resistance is the best.

so your only using the ground up front? you dont have the batts in the back grounded straight to the frame ?

 

[muskyhunter567 10+ year member]

but does a run of 1/0 have less resistance than an entire car frame? and you run 4k? how many amps are you drawing? isnt that a lil to much for one run of 1/0 to take

 

[Supergumby5000 5,000+ posts]

so your only using the ground up front? you dont have the batts in the back grounded straight to the frame ?

like i said, the path of least resistance is the best, 99 times out of 100. Technically, if your grounding ot the frame, the current is just taking a different route to the other battery.

 

[Supergumby5000 5,000+ posts]

but does a run of 1/0 have less resistance than an entire car frame? and you run 4k? how many amps are you drawing? isnt that a lil to much for one run of 1/0 to take

that current is going through more than just the frame getting back to the other battery.

 

[muskyhunter567 10+ year member]

what else is it going through?

 

[01 S 10 10+ year member]

ok, i see what your saying.

i think ill run grounds from the front to the back as well as a ground in the back going straight to the frame. just to cover all bases

 

[Supergumby5000 5,000+ posts]

think of it this way.

you have two batteries, and they need to be attached to each other.

if they were sitting right next to each other, you would just daisy chain them together.

if they are apart (your case), why not just do the same thing? battery to battery connections takes the current from one battery to another. battery to frame results in the current going through the frame, which is connected to the chassis, which is conected to multiple parts of the frame, which is connected to other electrical components, etc etc. That current is going everywhere, and that current is going to have more resistance than a b-line connection to the other battery.

the frame isnt the shortest path, either, because its traveling the same distance as the frame is.

 

[muskyhunter567 10+ year member]

ahhh i c do you ground in the back too or just two runs pos to pos neg neg battery to battery?

 

[Supergumby5000 5,000+ posts]

just battery to battery, no frame grounds.

 

[muskyhunter567 10+ year member]

thanks for clearing that up