Typically the boat has two battery banks one for starting/running and the other for house power. When at anchor you use the house bank so if it does run down you can switch to the starting bank in order to start the engine. You may also want to switch to a LED bulb which uses much less power than a standard bulb.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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