I mounted a second deep cycle marine battery with a selector switch. Ive have had to switch to it when my starter was failing. I dont think a jumper would have helped. If you do go with the jumper dont buy a Stanley, I saw three brought back to Sams club yesterday! I do buy the Duracell Deep cycle battery that Sams sells and have great luck with them.
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77 V20 cuddy with 170 I/O Mercruiser
72 16ft. Carolina w/a 25hp Evinrude
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