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Since no one has yet answered your question, I'll give it a try.

First of all your boat would be a 1973 model year, which could have been manufactured anytime from 8/1/72-7/31/73. That would make it tan in color and with black rubrail insert.

On all of these boats, 1973 and later, the navigation light wiring was run under, and inside of, the black rubrail insert. Entry and exit point to the rubrail is through a hole on the the upper side of the stern sidewall. From there, the wiring runs up to the bow light fitting inside the rubrail. At the stern, the wiring coming out of the rubrail terminates to a terminal block, which organizes the wiring for the bow light, stern light, negative ground to the battery, and switched power from the console, which runs in the boat's floor tunnel. You can see the whole situation in this photo of mine:

http://smg.photobucket.com/user/lgolt...0629856973

Only three of the four terminals are used. The black pigtail is for connection to the stern light pole. The white ancor 3-wire cable furnishes the neg ground back to the battery, and the switched power to the bow light and the stern light.