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  1. #1

    Default Smoking Battery Cables!

    hi,

    i have a problem with my fiat 70-66DT, it doesn't start easily due to bad cranking. and the positive battery cable gets really hot and sometimes starts smoking!! could it be incorrect cable sizes?? the heat/ smoking is a sign of resistance isn't it?
    any help would be greatly appreciated!

    regards

    gareth

  2. #2
    Veteran Member
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    Nov 2000
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    Columbia county NY
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    87 Ingersoll 444, 84 Ingersoll224/'44 GreavlyL/60'sGreavlyL/49 Ford 8N

    Default Re: Smoking Battery Cables!

    Sounds like a bad connection to me. Try removing the cables, and cleaning up where they attach. I bet that will work.

  3. #3
    Bronze Member
    Join Date
    Apr 2002
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    54
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    Navasota, Texas
    Tractor
    Kubota B7800HST, Gator 850D XUV

    Default Re: Smoking Battery Cables!

    Check the obvious stuff...corroded battery clamps (connectors), etc. Corrosion will "wick" its way up a cable.

    I've seen corrosion travel 4 feet down a wire before.

    Test the cable with an ohm meter. Anything over a couple of ohms on a cable this short means that the cable needs replacing as it is completely infiltrated with corrosion.

  4. #4
    Super Star Member RoyJackson's Avatar
    Join Date
    Nov 2001
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    19,587
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    Bethel, Vermont
    Tractor
    John Deere 4520 MFWD, Deere 855D UTV, Z920A Zero Turn Mower and assorted implements

    Default Re: Smoking Battery Cables!

    "the heat/ smoking is a sign of resistance isn't it?"

    Yepper!! You've got too much resistance on the line. This is your power (hot) lead, of course.
    Have you added anything to your electrical system...more lights, by chance? Or higher wattage bulbs?
    It could well be corrosion, as the other folks mentioned. I would replace the cable in it's entirety...ASAP! Before your tractor catches fire...

  5. #5

    Join Date
    Jul 2001
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    1,806
    Location
    Houston, TX.
    Tractor
    2001 TN65, 1951 8N Ford

    Default Re: Smoking Battery Cables!

    Do a voltage drop test. Set a DVOM on dc and touch on lead on the positive battery terminal and the other lead on the starter post. Crank the tractor and see how much voltage the meter shows. You will drop 3 or 4 volts with that much amperage going through the cable without any problem, I'll bet you show 6 volts or better. This loaded test is way better than a resistance test, all it takes is one connected strand in the cable to show zero ohms.

  6. #6
    Veteran Member
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    Jan 2002
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    1,927
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    Home-1+ acres New Hope, TX / 24 acres-Fannin County
    Tractor
    JD 950

    Default Re: Smoking Battery Cables!

    Corrosion will cause heating, but the heating would be at that point in the connection, not the cable itself. I would guess either the cable has been replaced with an undersized cable. Or the cable has a partial break somewhere under the insulation. Definitely replace the cable.

  7. #7
    Veteran Member
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    Jul 2000
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    1,344
    Location
    West Virginia (Eastern Panhandle)
    Tractor
    '78 Kubota B6100DT

    Default Re: Smoking Battery Cables!

    Could be a combination of things: Maybe it's hard to start due to a weak spark (if gas engine) or something. Cranking it for a long time will heat up the battery cable. I had that happen on my motor home once and nearly melted the lead post connector on the cable in the process. When they say don't crank for more than 10 seconds (or whatever) between cool down cycles, I found out the reason...

  8. #8
    Elite Member hazmat's Avatar
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    Feb 2002
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    4,028
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    West Newbury, MA & Harrison, ME
    Tractor
    Kubota L5460HSTC

    Default Re: Smoking Battery Cables!

    A loose connection will cause resistance which will increase amp draw which causes the wire to heat up.

  9. #9

    Default Re: Smoking Battery Cables!

    thanks guys,

    my guess is that when we bought the tractor, they replaced the old battery cables for new thinner ones. they look new and cheap. another thing that i noticed is that both cables get hot, not only the positive one! corrosion is another problem i have. i will replace both cables with thicker ones and see!!

    thanks for all the replies!!

    regards

    gareth

  10. #10
    Gold Member
    Join Date
    Apr 2000
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    427
    Location
    Bucks County, PA
    Tractor
    Kubota B2400

    Default Re: Smoking Battery Cables!

    <font color=blue>another thing that i noticed is that both cables get hot, not only the positive one!</font color=blue>

    Makes sense, they are both carrying the same amount of current.[img]/w3tcompact/icons/smile.gif[/img]

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