In this video I add a second battery to my boat The Green Machine. Having dual batteries that are selected with a switch will allow me to make sure I can always start the boat, even if one battery is run flat by the lights and fish finder.
Battery switch: http://www.marineengine.com/products/accessory.php?in=1306011
Video about voltage drop https://www.youtube.com/watch?v=5tGCepHveHk
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