What do I need to do for 24v?
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What do I need to do for 24v?

  1. #1
    Senior Member STV_Keith's Avatar
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    Default What do I need to do for 24v?

    I've got a twin engine boat with two batteries. Currently, the batteries share a common ground, and each engine has it's own switch so that either engine can run off battery 1, battery 2 or both.

    What I want to do is keep what I have now, and wire in (I believe) an isolator and another pair of switches to offer 24v to each starter ONLY. What would be the wiring changes and hardware required to do this?

    Here's the current configuration:



    Thanks!
    Last edited by STV_Keith; 01-10-2010 at 05:32 PM.
    Keith-


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  3. #2
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    Red-X buddy. What are you going to do with a 24V starting system?

    Going to have to give this some thought, but I'm not sure you could pull 24V out of it as you have to put the 2 batteries in a series at some point with one negative post being tied to the other battery's positive post. Pretty sure you'd have to disconnect all the 12V stuff in some manner or you're going to have a great big spark show.

    You'd almost be better off adding a seperate 24V system with another pair of batteries, like some small oddesys or something. Probably be less chaotic than what I am envisioning for this to work without burning it to the waterline.

  4. #3
    Senior Member 78Eliminator's Avatar
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    Quote Originally Posted by jordy View Post
    Red-X buddy. What are you going to do with a 24V starting system?

    Going to have to give this some thought, but I'm not sure you could pull 24V out of it as you have to put the 2 batteries in a series at some point with one negative post being tied to the other battery's positive post. Pretty sure you'd have to disconnect all the 12V stuff in some manner or you're going to have a great big spark show.

    You'd almost be better off adding a seperate 24V system with another pair of batteries, like some small oddesys or something. Probably be less chaotic than what I am envisioning for this to work without burning it to the waterline.
    Im with Jordy on this one. Why would you need 24 volts on a 12 volt system.

  5. #4
    Senior Member STV_Keith's Avatar
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    The quick answer is voltage makes RPM. My motors need more RPM than I currently have, which is why they start easy on the charger. I'm going to try a new starter first though...24v start will be a last resort.
    Keith-


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    If the problem is that your compression or the ignition advance is too much for your starter to overcome. Try releasing the lanyard - turn the key - with no ignition on the engine will turn over a lot faster - once they are turning push in the lanyard switch and the engine will fire. This also works if you have an almost dead battery.

  7. #6
    Senior Member STV_Keith's Avatar
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    No lanyards on this fishing boat. Good thought though.
    Keith-


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