Seems like you’d want to be careful with the source of the electrons so the negative terminal would be covered/protected and the positive would be wired to the frame. But it is the opposite. I presume there is a good reason that I do not understand.
In: Engineering
Ground is simply defining a given point in the circuit as a 0 reference. It doesn’t much (there are some secondary considerations) matter which way it is as long as you’re consistent about it. Lots of old vehicles, military vehicles, and old military vehicles do it the other way around and define the positive side of the battery as ground. It’s even fairly straightforward to convert a vehicle’s grounding.
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