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Hello everyone, I'll be removing the engines from Shambala this week. During this process, I need to address the grounding of the DC electrical system, which was originally grounded to the engine block. This is necessary while the gas engines are out, and I'm preparing for the installation of the new diesel engines. My goal is to ensure that I can still operate the stereo, interior lights, and cockpit spreader, all of which run on the DC side of the electrical system. Thank you in advance for your advice!

on 12v a ground back to the battery is good enough.

The bonding system should go to a common negative ground. Sounds like they used the block as the common negative bond.

The engine block should be tied into the ground and bonding system but don't run your grounds to the engine block then the block to the bonding or negative terminal on battery. I've seen galvanic action eat up engine blocks doing it this way.

A good buss bar as a central tie in point is the way to go.