Re: Grounding wires attach what?
...Greens to a bus and the bus to the block, or greens to the negative side of the battery...?
A conductor with GREEN insulation is normally used as a bonding conductor. There is no guarantee that because a conductor has GREEN insulation on your boat that it was a bonding conductor. Assessing the function or purpose of a wire based only the color of its insulation can be a dangerous practice. It is very common for boat wiring to be non-compliant with the suggested color coding of the conductors.
I cannot offer you any advice about your specific boat. I cannot see it. I have no idea what you have there. Let me offer some general advice, which you can then apply to your situation if you find something analogous.
The bonding system is usually associated with any metallic component in the fuel system. Metal components like a fuel inlet fitting, a fuel tank, and any other metal components of the fuel system, are typically bonded together with an electrical conductor of 10-AWG and with GREEN insulation. The bonding system is then connected to the sea via an electrode that is always immersed, typically a dedicated electrode installed below the waterline, especially on boats with non-conductive hulls, like a fiberglass hull boat. I believe that this was considered the recommended and best practice for boats made up to c.1995. After that epoch, the used of a dedicated electrode in the sea for the bonding system was not as common. The bonding system was then tied to the battery negative terminal, particularly on outboard engine boats. On outboard engine boats it is common that the outboard engine has electrodes that are on its lower unit. These electrodes are bonded to the aluminum of the outboard engine, as is the battery negative. In this way, the bonding system is connected to the sea via the electrode on the outboard engine. On boats with sterndrives or inboard engines, I don't know what the current practice for connecting the bonding circuit to the sea.
The wiring devices you call "eyelets" are probably what are more properly called ring terminal connectors.
In any wiring, but especially in marine wiring where there is a lot of movement and vibration, it is a very bad practice to accumulate more than one connection under a terminal post. You should not stack ring terminal connectors under a common binding post. This is particularly important at the battery terminals. The number of conductors and ring terminal fittings under the binding post of a battery terminal should be limited ideally to one, and practically to perhaps two.
The bonding circuit should never be wired or installed so that current flows on it in the normal distribution of power. The bonding circuit is only to keep all of the metal components attached to the bonding circuit at the same potential.
The above are all general remarks about bonding circuits and boat wiring. Again, there is no way to make a specific recommendation to you about your boat and the wiring you have on that boat. The green wires could be anything.
