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Re: Making a good AC ground?
Chip, in 1978 if you were lucky your household wiring had a dedicated third ground lug, so it is no surprise your boat's AC didn't.
There are different philosophies about whether and how a boat should have a grounding system, versus a bonding system, and whether the AC and DC ground should be run in common, or attached to the bonding system all as one.
I think if you search around on these topics, it will get confusing--and then clear. The decision is yours as to what to run to a common bus, but you certainly can keep it flexible by running any AC grounds to one common point, one bus bar, and then deciding whether or what to join that to.
Of course the proper way to run an AC ground on a boat is by running a suitable gauge cable to a pair of 8' long copper ground bars, and pounding that into the earth next to your anchor. (G)