Is a second Batt. worth it?

[pearlsjam79 10+ year member]

Can you ground the second batt somewhere in the trunk rather than running wire all the way from the front batt?

 

[Kern417 10+ year member]

you dont ground the alt. you run 1/0 wire from the alt pos to ur batt pos. batt neg to chassis and chassis to engine block is how mine is.

by grounding the block you are grounding the alt....it's mounted to the engine so the easiest way to ground it is wire from the chassis to a mounting bracket bolt

also i couldn't imagine an alternator would put out an increasing amount of current in the 2-4k rpm range...so keeping your rpms that high won't make much of a difference. better alternators will put out higher current at lower rpms

 

[Kern417 10+ year member]

Can you ground the second batt somewhere in the trunk rather than running wire all the way from the front batt?

yes that's actually what you are supposed to do. Keep the grounding wire as short as possible, and ground it directly to the chassis just like you would do with the amp.

 

[bubbagumper6 5,000+ posts]

by grounding the block you are grounding the alt....it's mounted to the engine so the easiest way to ground it is wire from the chassis to a mounting bracket bolt
also i couldn't imagine an alternator would put out an increasing amount of current in the 2-4k rpm range...so keeping your rpms that high won't make much of a difference. better alternators will put out higher current at lower rpms

Your correct in your first statement, but most (if not all) alternators have a higher current output at higher RPMs.

 

[skmfkr 5,000+ posts]

Your correct in your first statement, but most (if not all) alternators have a higher current output at higher RPMs.

which is usually 2k rpm not 3k-4k

 

[audiolife 5,000+ posts]

yes that's actually what you are supposed to do. Keep the grounding wire as short as possible, and ground it directly to the chassis just like you would do with the amp.

That would be dependent on the vehicle, if its a unibody no way in hell I would do this. All you are doing is completing the circuit with the run of negitive. You eliminate a few potential problems with grounding back up front.