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Technical Battery Cable Sizing?

Discussion in 'The Hokey Ass Message Board' started by 5window, Oct 2, 2025.

  1. 5window
    Joined: Jan 29, 2005
    Posts: 9,939

    5window
    Member

    I am contemplating moving the battery which currently rides under the floor of my A coupe to the trunk so this 76 year old not as strong as I used to be can access it. Current access involves dropping so exhaust,tight work to free the hold downs and shifting the battery with one hand while lying on the floor. This would add about 5-6 feet of cable. What size do I need. The gas tank is in the trunk now-what safety precautions do I need? Finally, is the a way to attach the new cable to the ends of the existing cables which have battery clams on them> Thanks for the ideas
     
  2. Zax
    Joined: May 21, 2017
    Posts: 871

    Zax
    ALLIANCE MEMBER

    Are you running 12 or 6 Volt?
     
  3. 325w
    Joined: Feb 18, 2008
    Posts: 6,465

    325w
    ALLIANCE MEMBER

    Welding cable is your friend
     
    302GMC and seb fontana like this.
  4. 5window
    Joined: Jan 29, 2005
    Posts: 9,939

    5window
    Member

    sorry 12 volts 350 SBC
     
  5. evintho
    Joined: May 28, 2007
    Posts: 2,558

    evintho
    Member

    I'd just go with all new 1/0 ga. batt cables. Can't say enough about these guys......
    https://www.batterycablesusa.com/0-gauge-1-0-awg-extreme-battery-cable-with-ends
    Quality product, good prices and fast shipping.

    Not a problem if the batt is occupying the same trunk space as your gas tank. Pick up something like this to isolate the batt from the tank.......
    https://www.amazon.com/dp/B0CSTDNC2F/?tag=atomicindus08-20

    I put the batt in the trunk of my '54 with a batt box and ran almost 20' of positive cable all the way to my fender mounted solenoid in the engine bay. Never a problem.

    battery.JPG
     
    trulyvintage and seb fontana like this.
  6. squirrel
    Joined: Sep 23, 2004
    Posts: 59,601

    squirrel
    Member

  7. This ^^^^^^^^^^^^^^ is the way to go
    Before you call them, figure out the shortest
    way to route the positive battery cable from
    where it originally went from your battery
    to the new battery location without risking
    chafing or rubbing or exposing it to heat
    or the elements, that is the length of the
    cable you will need. They probably have
    plastic wire loom to fit over the cable
    that you can purchase by the foot.

    Do not count on the frame to carry the
    negative cable to where it originated,
    install proper bonding jumpers to join
    frame components to ensure an solid
    path, buy a new cable if you are in doubt.

    Once you have engineered your design
    call them and ask their advice before
    you place your order.

    Jim
     
    5window likes this.

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