Can i ground amps to rear battery?

[Carnivorous18 10+ year member]

The amps need to be grounded in the same place (unless I had one amp under a seat and the other in the trunk) right? What's the max length the ground from the amps to the rear battery can be?

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[bhsdriller 10+ year member]

yes they can, that's where probably 99.9% of people that run multiple batteries ground their amps at

idk my ground now is probably close to 20"

 

[bubbagumper6 5,000+ posts]

They don't HAVE to be grounded in the same place but it's generally advisable to avoid ground loop issues. Yes you can ground them to the rear battery, that's fine as long as the rear battery is connected to the chassis/front battery -/alternator case (any of those). There's really no max length for grounds either, it depends on the wire gauge, it's generally desirable to keep them as short as possible to minimize losses.

 

[Carnivorous18 10+ year member]

Alright, thank you both. I drilled a hole in my trunk close to the strut tower, i'll sand it down too but I hope its good enough of a ground

 

[6.5LDiesel 10+ year member]

I did the same thing, and used a 1/2 bolt to ground the battery to the frame