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    Question about 2 batteries, 2 chargers, and switches

    Not ideal setup but simple and good enough for the particular boat: two AGM batteries, positive terminals connecting to a 1/2/1&2/OFF switch, and on the other side, to a common (one for both batteries) ON/OFF ground switch. Question— I have two chargers and would like to use both - one per...
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    Variance in water pressure

    I have a 2022 Mercury 150 four stroke with 72 hours. A friend with more experience with powerboats (I've been a sailor and kayaker mostly) has expressed concern about the variance in water pressure. At idle, water pressure holds steady at 6 psi. At cruising speed on plane, water pressure varies...
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    Parallel battery specs

    Hello. I'm adding a second battery to a boat with an outboard (2022 Mercury 150 4S). The two batteries will be wired in parallel. The first battery came with the boat and outboard, all of which are six months old and have 30 hours of use. That battery - not my choice - is an Optima Blue Top...
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    RPM range question

    Hello. Bought a boat last summer, a small (25 foot) but comparatively heavy-ish walkaround with a pilothouse, berth and some amenities. It's equipped with a Mercury 150 four stroke. The original prop was a 14.5 dia with a 15 pitch. The boat had problems: not enough grip, sliding in turns, very...
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