2nd Battery Ground ?

[Oldskool 10+ year member]

When running a second battery in the trunk (grounded to the frame) is it safe/wise to ground your amps to the second battery's negative terminal?

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[Chevyaudio 5,000+ posts]

No problem just ground to the 2nd battery's negative terminal.

 

[lotas 10+ year member]

the reason for grounding is to complete the circuit. The current from your amp gets back to the battery through the chassis, thats why you ground your amps to the chassis. Your chassis is like a gigantic wire connecter, where your amps are connected in one end and your battery (-) is connected to the other. Therefore if you are grounding back to your battery's (-) terminal you are just bypassing the whole chassis idea. Ive read it can end up causing dB gain, but I've read some that say no. Go for it.

 

[btnhfan 5,000+ posts]

Yep you usually gain going straight back to the first battery.