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"How to Wire Boat Running Lights to the Battery. Wiring your boat's navigation lights doesn't need to be a wiring nightmare. Marine safety duplex cable combines the \"hot\" power wire and the ground wire in a single cable, allowing you to make the run from battery to all the running lights without a cumbersome return loop of wire to the battery. It also allows you to avoid tying into the boat's common ground, reducing the possibility of your boat's navigation lights going dark unexpectedly."
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