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Update. After dreading going through the bow rail to troubleshoot the navigation light, I was pleasantly surprised. Found that all one has to do is remove the molded end of the bow rail on the stbd side then pull the round tubular shaped portion of the bow rail from the portion screwed to the hull and one easily gets at the wiring in the bow rail. Seems like a previous owner installed a cover and put the snap-on connectors in the bow rail. One of the screws went right through the wiring and shorted the wires together. Problem solved! Repaired the wiring, poked the round portion of the bow rail in place, and replaced the molded end of the bow rail.

It was one of the easier maintenance actions I've taken on a boat :-)