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Thread: Battery size

  1. 03-06-2011, 03:47 PM #1
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    fingerlicken
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    Default Battery size


    I have just put a 788ci di on the front of my boat and I am getting some interference as soon as I step on the trolling motor. Motorguide said I needed a bigger cranking battery because thats were I have the graphs hooked up at. The battery that is in there now 625 marine cranking and 700 cold cranking. They said to get one that is a 1000 cranking amps. What battery would you all recommend?
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  2. 03-06-2011, 04:03 PM #2
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    Are you using a built in trolling motor transducer



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  3. 03-06-2011, 05:04 PM #3
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    Quote Originally Posted by fingerlicken View Post
    I have just put a 788ci di on the front of my boat and I am getting some interference as soon as I step on the trolling motor. Motorguide said I needed a bigger cranking battery because thats were I have the graphs hooked up at. The battery that is in there now 625 marine cranking and 700 cold cranking. They said to get one that is a 1000 cranking amps. What battery would you all recommend?
    You might try some other troubleshooting ideas first...before spending money on a new battery that may not be the problem...

    Make sure no other electronics are on when you test for interference....
    Make sure sonar unit power wires are not connected to TM batteries...test for interference
    Remove xducer from TM and stick in water (temporarily) FAR away from TM...test
    Run temporary sonar power wires from head unit to battery FAR away from any other wires (even down the floor of the boat)and test for interference....

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  4. 03-06-2011, 06:25 PM #4
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    Quote Originally Posted by wilbur View Post
    Are you using a built in trolling motor transducer
    No I am not
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  5. 03-06-2011, 07:03 PM #5
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    Make sure you are powering the 788 from the starting battery and not the TM battery. FYI never connect electronics to a trolling motor battery.
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    Bill H. PTC USN Ret
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  6. 03-07-2011, 04:20 AM #6
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    My graphs are hooked to the cranking battery thats why I cant figure out why I am getting interference when I step on the tm.
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  7. 03-07-2011, 05:39 AM #7
    Meat Man
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    Where is your transducer mounted ?
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  8. 03-07-2011, 05:48 AM #8
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    Quote Originally Posted by Meat Man View Post
    Where is your transducer mounted ?
    Transducer is mounted on the trolling motor. I might try putting some rubber between the trans. and the trolling motor
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