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  1. #11
    Registered Reed Jensen's Avatar
    Join Date
    Dec 2003
    Los Angeles California
    Normally... the numbers on the switches denote the batteries... not the motors. So #1 is one battery. #2 is the other battery. If your switches are wired like mine... you would want to run one switch on #1 while starting and running and the other switch on #2 while starting and running. Then,,, if you are moored and want to keep one battery fresh... just switch one of the battery switches to the "off" position.Then you can reverse the switches to start the motors. But.... you have to make sure both systems are isolated... if they are not... then power will trickle over to the other side and both batteries will go dead... There is a simple way to determine if they are not cross wired... but it would be way too hard to explain in text.

  2. #12
    Registered waterbum's Avatar
    My Boats:
    1986 Fountain 10 Meter
    Join Date
    Nov 2000
    Overland Park, KS
    Here is a link to a cool set up for twin engine, 2 battery systems. 1 battery is always used for cranking both engines, the other is for electrical systems. Can still use both for starting if needed.

    That site also has some other pretty interesting articles on general boat maintenance.

  3. #13
    VIP Member VIP Member OldSchool's Avatar
    My Boats:
    Cigarette CC and Boston Whaler currently
    Join Date
    Dec 2001
    On my boat(twin engine, twin battery, twin charging), It says to run the boat with both switches on "1". It says on the panel not to run the boat with the switches in the "Both" position or it will damage the charging system. I haven't traced it out, but I'm assuming that the"1" position on each switch runs that corresponding battery....confused yet?


  4. #14
    Registered Shorty's Avatar
    My Boats:
    1999 Mach1 290
    Join Date
    Apr 2001
    LOTO / Overland Park, KS
    Originally posted by Reed Jensen
    There is a simple way to determine if they are not cross wired... but it would be way too hard to explain in text.
    Uhhmm... set switch to battery 1, put vhm (volt meter) negative on battery one negative, positive on battery 2's positive. If you show anything, you've got circuits crossed somewhere.

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