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Thread: Dual Start Batteries

  1. 22nd July 2017, 10:06 AM #1
    Ean Austral Guest

    Dual Start Batteries

    Gday All,

    This is not relevant to any single type of vehicle , but if connecting 2 x 12 volt batteries to start a 12 volt system , Can the 2 negative leads be earth to separate spots and not connected to each other ??

    I know the Positive side needs to be connected between both batteries , but does the negative side.

    I have only ever seen systems in both 12 & 24 volt where the batteries were connected both positive & negative as they were close together , but lets say you have a battery on each side of an engine bay and you want to connect them both as constant start batteries.

    Thanks and Cheers Ean
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  2. 22nd July 2017, 11:37 AM #2
    Old Farang
    Old Farang is offline Wizard Supporter
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    Yes, no problem providing both earth points are connected to a common part such as the block of the engine.
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  3. 22nd July 2017, 12:58 PM #3
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    Homestar
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    As mentioned, no dramas - connecting both to the engine is a good idea as the metal between the connections need to carry some decent current. Just bolting each earth to a panel for example would be a bad idea. Both to the chassis would work ok too, but just make sure that anywhere you choose is a solid connection to the other electrically than can conduct a decent whack of current like when the starter or winch is running.
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
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  4. 24th July 2017, 06:55 AM #4
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    numpty
    numpty is offline TopicToaster Silver Subscriber
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    As said, no problems. My 2 start batteries have earths in different places with no issues.
    Numpty

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  5. 26th July 2017, 06:57 PM #5
    DiscoMick Guest
    Mine has both. More is better.
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