Best ground for batterys?

[MmatsDude 10+ year member]

How to best ground your batteries?

Ground both trunk and under the hood batteries together. Run ground wire from hood to trunk to ground both together and also ground them to chassis. Or just ground both separately to chassis?

And not spend the extra cash on ground wire.

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[winkychevelle 10+ year member]

How to best ground your batteries?
Ground both trunk and under the hood batteries together. Run ground wire from hood to trunk to ground both together and also ground them to chassis. Or just ground both separately to chassis?

And not spend the extra cash on ground wire.

It depends on the chassis. My truck has a solid full length frame so grounding to it in the rear and under the hood is no big deal.

My car on the underhand is a unibody design in which the frame is the body itself. There are lots of welds adhesives painted surfaces that could cause for a bad ground location in which a dedicated ground run may be better.

Ideally you want the least resistance in between your grounding location and front battery negative as possible.

 

[MmatsDude 10+ year member]

It depends on the chassis. My truck has a solid full length frame so grounding to it in the rear and under the hood is no big deal.
My car on the underhand is a unibody design in which the frame is the body itself. There are lots of welds adhesives painted surfaces that could cause for a bad ground location in which a dedicated ground run may be better.

Ideally you want the least resistance in between your grounding location and front battery negative as possible.

I have a 2003 Lincoln town car I believe it’s a full body frame. I am not sure ?

I think I am going to run a full ground run from front to back just to be safe

But is it really worth it spending the extra cash on ground wire ? Etc

 

[winkychevelle 10+ year member]

I have a 2003 Lincoln town car I believe it’s a full body frame. I am not sure ?
I think I am going to run a full ground run from front to back just to be safe

But is it really worth it spending the extra cash on ground wire ? Etc

Is it worth it? Well that's hard to answer. Is it worth the piece of mind to know that you have the best ground possible? Depending on the vehicle it may solve many voltage issues due to bad grounding.

Is it required? No not by any means, the frame of a vehicle can often flow much greater amounts of current than a 1/0 wire.

The trouble comes from body isolation mounts, painted surfaces, small contact points on factory ground straps and so on.

Like I said earlier it depends on the vehicle. You may try grounding to the frame and it work wonderful. It might not. Too many variables to say for sure

 

[wew lad 5,000+ posts]

If you're running over 5kw rms I'd run a dedicated ground

 

[MmatsDude 10+ year member]

If you're running over 5kw rms I'd run a dedicated ground

I’m running about 4200 wrms

 

[MmatsDude 10+ year member]

Is it worth it? Well that's hard to answer. Is it worth the piece of mind to know that you have the best ground possible? Depending on the vehicle it may solve many voltage issues due to bad grounding.
Is it required? No not by any means, the frame of a vehicle can often flow much greater amounts of current than a 1/0 wire.

The trouble comes from body isolation mounts, painted surfaces, small contact points on factory ground straps and so on.

Like I said earlier it depends on the vehicle. You may try grounding to the frame and it work wonderful. It might not. Too many variables to say for sure

I am just going to do both

2 runs of 2/0 flexaprene welding wire for power and 1 run of 2/0 flexaprene for ground

 

[wew lad 5,000+ posts]

I’m running about 4200 wrms

you'll be fine with what you're planning on

 

[Papermaker85 5,000+ posts]

With 300+ amps I'd ground everything very close. The alt and batteries. If not a run of 1/0 to bond all your grounds.