Originally Posted by asdf38
I consider it safe to assume that when someone says ground, especially in a DC system they mean return, or in this case battery (-).
That might be what they are refering to but that's technically incorrect. They are not the same as clearly stated in ABYC rules, "DC grounding systems shall not be used as a return conductor".
Stan Honey seems to be confused as well in the marine grounding systems article. He states "we need a DC ground or return line" as if they are the same thing and then, when defining ground, he goes on to say "never use the mast, engine, or other metal object as part of the return circuit". Why? Because they are ground, not DC return. Two different things.
The boats DC ground system wiring should not normally be conducting current as the DC negative/return/grounded wiring does.