Ground bonding secondary/aux battery & ground to battery vs frame

Hi all I have the juniper overland dual battery kit on order as well am planning to wire up a BSS distribution block and have a few questions:
- The Juniper Overland kit only has the AUX battery grounded to the negative terminal of the Start battery.
- I've read in the past about ground bonding house batteries to the start battery AND a chassis connection point near by.
- Is there a specific reason to NOT give the house battery a chassis ground point in addition to it's connection to the start battery's negative terminal?

- What should be grounded directly to the battery VS the chassis?
- E.G. for an Auxbeam controller, would it be best practice to run a negative lead to the battery's negative post OR to the frame (Ideally to the same chassis ground point the start battery uses)?

 

I generally prefer to ground to the chassis, and add onto the battery to chassis connection with a 1/0 ground cable.

I suspect their reasoning has to do with the factory chassis ground being inadequate for the load.

 

What are your thoughts to there being a ground between the two batteries and both batteries having a ground to chassis?

 

Boy, I believe in good grounds! (Said as the owner for 40+ years of a vintage Triumph TR3...)

I've not put in a dual battery system in any of my Tacomas, but having everything on the same ground plane and well-bonded has always worked for me. (I had a VW Jetta years ago that had whole-number voltage differences between different ground points on the vehicle. Dayum, no wonder so much was hinkey. Bonding all the bits together with copper braid fixed a lot of problems.)

 

Just anecdotal.

Frame is a conductor, Frame & body negative (including some factory stuff) goes from frame to neg terminal of battery.

Connect to frame for low amperage crap. Connect to battery for high amperage crap (example a winch).

No need to over think it.

 

I consider that a great potential for a ground loop, which could create noise in other systems.


The important thing is to never remove the factory grounds. Add your new grounds on top of the factory grounds.

The reasoning being that the factory wire is suitable for the factory loads. The new wire is suitable for your new load