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Battery cut off switch.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by GreenPete359, Oct 31, 2020.

  1. Oct 31, 2020 #1
    GreenPete359

    GreenPete359 Road Train Member

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    What amperage should i be looking at? The one i’m looking at is 350amp consistent & 2,500 for 5 seconds.

    Big Switch 500 with Lock-Out Bracket

    I’m also interested to hear if you guys would put it on the positive side or ground side?

    this is for my ‘79 Pete has a Big Cam Cummins running 4 Batteries & 12 volts.
     
    GreenPete359, Oct 31, 2020
    GreenPete359, Oct 31, 2020
    #1
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  3. Oct 31, 2020 #2
    AModelCat

    AModelCat Road Train Member

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    Always on the ground side.

    Allegedly it arcs less.

    Also. If the switch happens to fail and ground out internally, with it on the positive side it will likely burn the truck down. At least if its on the ground side it won't.
     
    AModelCat, Oct 31, 2020
    AModelCat, Oct 31, 2020
    #2
    Roger McG, GreenPete359 and InTooDeep Thank this.
  4. Oct 31, 2020 #3
    GreenPete359

    GreenPete359 Road Train Member

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    you settled that. Thank you.

    Pretty much all boats have a cut off switch & they all have them on the positive side, so when i was told put it on ground i naturally questioned it.
     
    GreenPete359, Oct 31, 2020
    GreenPete359, Oct 31, 2020
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    AModelCat Thanks this.
  5. Oct 31, 2020 #4
    AModelCat

    AModelCat Road Train Member

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    Everything I've ever worked on with a disconnect has had it on the ground side.

    I'd imagine with boats being fibreglass you wouldn't have to worry about it grounding out. Fibreglass is a great insulator.
     
    AModelCat, Oct 31, 2020
    AModelCat, Oct 31, 2020
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    GreenPete359 Thanks this.
  7. Oct 31, 2020 #5
    pushbroom

    pushbroom Road Train Member

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    Petes always run them on the positive. Not sure it makes much difference
     
    pushbroom, Oct 31, 2020
    pushbroom, Oct 31, 2020
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  8. Nov 1, 2020 #6
    Inderjit

    Inderjit Medium Load Member

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    Kenworth always installed the disconnect switches on the positive side as well.
     
    Inderjit, Nov 1, 2020
    Inderjit, Nov 1, 2020
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    Oxbow, GreenPete359 and spsauerland Thank this.
  9. Aug 12, 2021 #7
    spindrift

    spindrift Road Train Member

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    How do you determine whether or not the amp rating of the switch is correct for your specific application?
     
    spindrift, Aug 12, 2021
    spindrift, Aug 12, 2021
    #7
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