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long bat cable

Discussion in 'The Hokey Ass Message Board' started by 32v, Feb 19, 2012.

  1. 32v
    Joined: May 20, 2007
    Posts: 946

    from v.i.

    i know you can't run too long a + cable with out current drop, but can you run a long ground with no issues ? i'm thinking of off switch at rear of car for the ground
  2. tommy
    Joined: Mar 3, 2001
    Posts: 14,758

    Member Emeritus

    The ground is just as critical as the pos. cable to complete the circuit.
  3. The longer the wire the more resistance {ohm's} it has, a larger diameter wire will have less ohms per foot, than a smaller diameter wire, also the more strands inside the better{less ohms} and more flexable it will be.
  4. 32v
    Joined: May 20, 2007
    Posts: 946

    from v.i.

    so i guess its a no go for off switch back of car. the ground would have to go back to the switch then back to the battery (up front)
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  5. aaggie
    Joined: Nov 21, 2009
    Posts: 2,529


    Just a couple of thoughts. Why not put a disconnect switch under the hood by the battery. Open the switch and lock down the hood.

    If you ever need long cables it is better and cheaper to get them made up at a local welding supply. They charge by the foot for really good multi strand cable and they will crimp on the cable ends for you.
  6. Rem
    Joined: Mar 6, 2006
    Posts: 1,256


    The cable could go from the battery to the switch, and then to chassis, couldn't it?
  7. 26 roadster
    Joined: Apr 21, 2008
    Posts: 2,015

    26 roadster

    I have done mine like this for some time
  8. 201
    Joined: Dec 17, 2002
    Posts: 344


    I think you are better off having the disconect switch on the positive lead. And the easier it is to get to the switch, the more you'll use it. If batery is in trunk, why not a good ground at the battery to a lug on the frame, and a ground strap from motor to frame??
    Both could be short wires.
  9. H.G. Wells
    Joined: Mar 11, 2006
    Posts: 386

    H.G. Wells

    I mounted a master disconect on a dragster and ran a morse cable to the switch from the back of the dragster. That way you do not have to run a bunch of battery cable. Might work for your application. Still meets NHRA specs for the cut off at the back of the car.
  10. This is the best way to go.

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