I would remove the port and starboard navigation light fixtures one at a time and disconnect the 12V positive wire to see if the fuse still blows. If it does still blow after both are disconnected then there is a short in the wiring. Have you done any work recently?
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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