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I am sure they are talking about the negative terminal, it goes to the negative shunt mounted on the inside of the battery box, they WARN that if the negative lead fails, has a poor connection or has inadequate wire size you will over-volt the 12V side so the ground is THE most important connection.
You need big wire (10ga MIN) and the correct terminals installed with the correct tools ( I always solder them after using a hydraulic crimper on them then I seal them with gelled heat shrink.
Do it right the first time.....
I see a bolt on the left side of the shunt that is already pretty crowded, I think that's probably the best ground.
Made my own mondo ring terminal- notched this washer and soldered the 10ga wire in. Seems to be holding as I couldn't yank or wiggle it out.
![RingTerm.jpg RingTerm.jpg](https://www.steelsoldiers.com/data/attachments/653/653290-26f54361f67ae58bb691e557ba316644.jpg)