adding rear battery, ground to front batt or chassis?

[skmfkr 5,000+ posts]

i want to run 1/0 pos and neg from the front batt to the rear batt and my friend is saying to just ground to the chassis.

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[Low_e_Red 10+ year member]

Ground to chassis. But do Big 3.

 

[05fronty 5,000+ posts]

hey also i was wondering what size fuse between the batteries? not to jump in but wondering?

 

[x2o 10+ year member]

hey also i was wondering what size fuse between the batteries? not to jump in but wondering?

Fuse for the wire, generally if your running 1/0 gauge fuse with 300a. I wouldn't really trust a smaller wire to connect batteries, but some people may do 4 gauge. If so fuse for 4 gauge. If running 2/0 fuse for 2/0, etc.

 

[ughhibye 10+ year member]

ground to the front batt

 

[GMCJimmyslt2000 10+ year member]

theres no reason to ground to the front batt, just ground to the chasis

 

[king ranch 5,000+ posts]

some vehicles are better to ground to front battery since its less resistance than the chassis ground depends on how good of a ground you can find and use, and the vehicle, i grounded to the front battery helped my voltage alot, in the back grounded to the frame the battery at full tilt would drop to around 12.2-12.4 grounded to the front and it stayed from 12.5-12.9

not the greatest but not bad considering stock alt and only one battery in the back on 2200rms

 

[jco1385 5,000+ posts]

the chassis is fine. but if you go huge (imo huge = 3k+) go to the front.

 

[SPL140.2 5,000+ posts]

I like to go to the front battery for power and ground.

egg

 

[audiolife 5,000+ posts]

if it is a unibody i would ground to both

 

[jco1385 5,000+ posts]

if it is a unibody i would ground to both

i don't follow. why is it different? (mine is unibody, grounded to chassis)

 

[bmborsk 10+ year member]

i want to run 1/0 pos and neg from the front batt to the rear batt and my friend is saying to just ground to the chassis.

Ive been told never to ground to chassis, make 2 runs of 1/0 from positive and negative of both batteries in parrallel.

 

[duece212 5,000+ posts]

i don't follow. why is it different? (mine is unibody, grounded to chassis)

Unibody you don't have a full frame running front to back...you have a rear sub-frame and front sub-frame, tied together via the body in the middle.

Full frame you just have more continuos steel running front to back without body mounts, etc in the way of electrical flow

 

[jco1385 5,000+ posts]

Ive been told never to ground to chassis, make 2 runs of 1/0 from positive and negative of both batteries in parrallel.

who lied to you?

Unibody you don't have a full frame running front to back...you have a rear sub-frame and front sub-frame, tied together via the body in the middle.
Full frame you just have more continuos steel running front to back without body mounts, etc in the way of electrical flow

makes since. works for me though so it will stay until the upgrade

 

[gsuchyta 10+ year member]

I'm just too lazy to run another run of 1/0 to the trunk lol

Some people notice a difference after grounding it to the battery and some don't. Just depends on how good of a ground you can get on your car