Grounding second battery

[boddy 10+ year member]

I'm running 2 runs of 0 gauge one for + and one for - as had quite a bit of 0 gauge and want to make sure that the 2 batteries are connected good. But is it still necessary for me to ground my second battery to the chassis?

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[sacsking916 5,000+ posts]

no. you now have a dedicated ground to your front battery, therefore your rear battery is grounded.

 

[bubbagumper6 5,000+ posts]

No it's definitely not necessary but if I had an extra foot or two of wire I would probably do it just for overkill...haha

 

[lionfamlee Premium Member]

^^^ Agreed! I would ground it in the rear for over kill. Are you grounding your amps to the chassis or the rear battery?

 

[boddy 10+ year member]

Grounding them straight to the rear battery

 

[NT_Hardcore 10+ year member]

you can never have to many grounds-

 

[sacsking916 5,000+ posts]

you can never have to many grounds-

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[lionfamlee Premium Member]

Grounding them straight to the rear battery

Yes, definitely. You would not do this if you just had a front battery, but since you'll have a rear battery then it's fine.

Check out this thread on dual battery wiring:

http://www.caraudio.com/forums/wiring-electrical-installation-help/398527-dual-battery-wiring-tutorial-why.html

 

[boddy 10+ year member]

WIRE 5
These wires are to ground each battery to the chassis for devices that may not have a NEG- wire running directly, but are still pulling power from the battery. A good example would be lights or other chassis grounded devices.

I would rather my rear battery only supply current to my audio system than run accessories. I know you can't seperate them while the engine is running but not grounding the rear battery would make the accessories current harder to reach my rear battery as it would have to pass over my front batteries terminals.

Think i might just leave it not grounded.

 

[Nut Hair Trick 10+ year member]

I have a Knu Konceptz grounding block that has (2) 0 gauge inputs, and like (3) 4-8 gauge inputs. One 0 gauge is going to the chasis, the other 0 is going to my 2nd battery. I use the other 4-8 gauge to go to my accessories. So the distro block is grounded to the car and the 2nd battery at the same time feeding my shit in the trunk. It may be overkill, but works out fine for me.

 

[bubbagumper6 5,000+ posts]

I would rather my rear battery only supply current to my audio system than run accessories. I know you can't seperate them while the engine is running but not grounding the rear battery would make the accessories current harder to reach my rear battery as it would have to pass over my front batteries terminals.
Think i might just leave it not grounded.

*facepalm*

 

[CAT MAN 5,000+ posts]

lol...

but i never grounded my rear batt with my front. just to the chassis....what could seriously hurt? If im grounded to the frame in both spots shouldnt it be fine?

 

[lionfamlee Premium Member]

I would rather my rear battery only supply current to my audio system than run accessories. I know you can't seperate them while the engine is running but not grounding the rear battery would make the accessories current harder to reach my rear battery as it would have to pass over my front batteries terminals.
Think i might just leave it not grounded.

????? Those other accessories are going to run the same load on the same current as everything else.