On Mon, 21 May 2007 18:16:26 -0700, Peter Bennett
wrote:

Disconnect the boat from shore power, and use an ohmmeter to check for
continuity between the Ground pin on the shore power cable and the
unknown wires. (If the boat has an inverter, make certain that it is
disabled while doing _any_ work on the 120VAC system!)

Thanks.

I think you meant to say the shore power connector (as opposed to the
cord) if I'm understanding your advice correctly.