Join Date: Oct 2016
Location: Lake Erie
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Re: Ground on a boat?
There's a bit of confusion here ...
The AC and DC grounds are separate.
They are also connected.
This is more than a little confusing, but it's also the same way house wiring is done. In a house, the white (neutral) wire is connected to the same place as the bare ground wire.
However, it's _where_ they are connected that is important. Electricity will always follow the path of least resistance. In a properly installed system, the ground is connected to the neutral, but it never carries any current unless something goes wrong.
The upshot being, it _does_ make a difference exactly how you connect grounding wires to the DC negative. You need to ensure you do it in a manner that will not cause current to flow along the ground wires under normal operating conditions. This may be very simple in your case, but if it seems confusing at all, I highly recommend that you pay a marine electrician for an hour of his time to explain the safest way to connect everything.