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Unfortunately, Whaler cheaped out on navigation light wiring for 30 years, running unprotected grey duplex wire directly in the boat tunnel, where it can easily get abraded and fail from other rigging work, forcing other cable through, etc. As mentioned, this is your problem.

In a Whaler floor tunnel, which end up filled with dirt and grime, wire should only be run that is Ancor boat cable, with white protective sheathing over the two encapsulated wires. Use 16/2.

You can see the Ancor boat cable in this photo:

http://photobucket.com/gallery/user/l...Gc=/?ref=1