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BBQ Boy,
I agree with the voltage check, but if you want to start on the simple side, just run a short run of wire from the stern light directly to the battery and see if the light works. If so, try a test light to see if you have power to the existing wires. If not check the switch for power. If you utilize the site search under the "main" link just below the header of this website there are many who have asked this same question before you. Just search, "Navigation light wiring" or "nav switch wiring" and there are a lot of good answers out there including wiring diagrams for all Nav light circuits and switches used by B.W for nav lights.


Jim G.