Adding a second battery ?

[BigAl 10+ year member]

I have a question on adding a second battery. I have 0 gauge wire running from my front battery positive to the trunk. I know im supposed to connect this wire to my second battery but do i run the ground wire from the front battery to the second battery or do I find a ground in the trunk for the second battery. Also when i connect my amps to the second battery in the trunk do i run the grounds to the battery or to a ground in the trunk. Thanks for your help.

Click to read more...

 

[ewadz3006 10+ year member]

I would run a pos. And neg. From front batt to back batt, and from back batt to amp. Just my. 02

 

[rebelfromva 10+ year member]

Best to run both runs from front batt to back batt. You can get away with grounding back batt in trunk just make sure it's a solid ground.

 

[Villeza1 10+ year member]

Amp pos and neg to rear batt, reat batt pos and neg to front batt, big 3...wala, magic.

 

[Bettr n' Revrse 5,000+ posts]

You need to fuse before the second batt as well

 

[bigdon1000 10+ year member]

Try to get identical batteries or the weaker one might go bad get a bad cell over charge and blow up. The car would still work fine because the second battery would still turn on the car and try to charge the battery with a bad cell. ***** so keep an eye on battery voltage on both batteries.