Pixhawk Attopilot 180A correct grounding

What is the correct way to connect the AttoPilot 180A ground wire without causing a ground loop when using two separately fed 6Ss into a PDB while only sensing one of the packs (I only want to monitor 1 pack)? Pixhawk is powered via the top power port using the original Pixhawk PM via a separate 3S (I’m not running the Pixhawk from the PDB).

 

I have hit a massive dead end after trawling the forums for hours, help greatly appreciated and the last thing I want is a ground loop.

Cheers

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