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  1. #11
    Veteran Member
    Join Date
    Jan 2002
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    1,927
    Location
    Home-1+ acres New Hope, TX / 24 acres-Fannin County
    Tractor
    JD 950

    Default Re: Smoking Battery Cables!

    <font color=blue>will cause resistance which will increase amp draw </font color=blue>
    This is an often stated misconception of electricity. An increase in resistance causes a decrease in current flow. Ohm's law is V=IR (voltage = current times resistance). Or to rearrange, I=V/R (current = voltage divided by resistance). As resistance increases, there is a proportional decrease in current.
    A bad connection does cause heating because of a voltage drop across that connection point. This can be thought of as the power loss across that connection. Power(in watts)=VA (volts time amps). Also Power=I(squared)R (current squared times resistance). If the connection were perfect (no resistance) there would be no power loss. As the resistance increases, the power loss is multiplied by the square of the current. That loss grows rapidly as the resistance increases, and thus the heating.
    Not trying to stir anything up, just want to clear the issue.[img]/w3tcompact/icons/smile.gif[/img]

  2. #12
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
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    46,366
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Smoking Battery Cables!

    Actually, a higher resistance will lower the current flowing through the circuit... but a coroded cable connection will make the cable drop a good amount of voltage across it, making it more of a resistor than a conductor... and it will start disipating a decent amount of power as heat.

    Someone probably put lawn mower cables on it or something similar.

    Soundguy

  3. #13
    Elite Member hazmat's Avatar
    Join Date
    Feb 2002
    Posts
    4,015
    Location
    West Newbury, MA & Harrison, ME
    Tractor
    Kubota B3030 loaded!

    Default Re: Smoking Battery Cables!

    OK I'm an idiot and forgot that Voltage = Current * Resistance.

    I was trying to quantify an experience I had with a loose connection getting hot. We had an inverter put in my dad's boat. They wired a switch so you could choose between shore power &amp; inverted power (both 110V). They didn't tighten up on the connection &amp; when turned on, the wire got hot &amp; started to melt the insulator. When the connection was tightened up, no problem.

  4. #14

    Join Date
    Aug 2001
    Posts
    542
    Location
    Campbellville, Ontario
    Tractor
    Kubota L3010, BX2200

    Default Re: Smoking Battery Cables!

    There are several likely reasons why your battery cables would be smoking:
    1) undersized cables, corroded cables, etc., which don't have the current handling capacity and are therefore basically being heaters;
    2) Too much load as a result of a starter motor malfunction (or load on the engine), which would put excessive draw on the battery and overload the cables
    3) Undervoltage at the battery, which would not allow the starter motor to operate correctly and spin up to speed. This could be due to a defective battery, or one with insufficient cranking power.

    2 &amp; 3 are as a result of the fact that electric motors draw a lot of current before they get up to speed due to a lack of 'back emf'. A stalled motor, or close to it, is basically a short circuit. Undervoltage doesn't deliver enough power to spin the motor up, and surprisingly enough can lead to a burnt out motor due to excessive current draw. I would try replacing the cables (which are probably shot by now anyway), testing with a new battery (which can be borrowed) and then replacing the starter.

    The worst possible thing is that the tractor engine is putting too much load on the starter. Hope its not that.

    Tell us what the fix was!

  5. #15
    Veteran Member
    Join Date
    Jan 2002
    Posts
    2,155
    Location
    SE Wa

    Default Re: Smoking Battery Cables!

    And don't forget that the ground cable has connections on -both- ends. I had much the same problem and after many sessions trouble shooting I found the problem was the connection at the other end of the ground cable, not the battery end.

    Harry K

  6. #16
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    46,366
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Smoking Battery Cables!

    You wouldn't believe how many ground connections I've seen made to a frame, etc, and the paint wasn't removed.. allowing only minute conduction ( if any ) threw the bolt face, etc.

    Soundguy

  7. #17
    New Member
    Join Date
    May 2011
    Posts
    1

    Default Re: Smoking Battery Cables!

    Ok so I replace the postive battery cable, negative battery cable, the battery and the cable to the starter and a resistor and it still won't start. It kind of whines and the resistor gets pretty hot. I've checked all over looking for a short and don't see one. Any other hints. By the way I'm a novice at this and this is my first tractor.

  8. #18
    Elite Member Don87's Avatar
    Join Date
    May 2010
    Posts
    4,226
    Location
    SW Pa.
    Tractor
    Massey Ferguson GC2400

    Default Re: Smoking Battery Cables!

    Quote Originally Posted by chuckokie View Post
    Ok so I replace the postive battery cable, negative battery cable, the battery and the cable to the starter and a resistor and it still won't start. It kind of whines and the resistor gets pretty hot. I've checked all over looking for a short and don't see one. Any other hints. By the way I'm a novice at this and this is my first tractor.
    Congratulations, you are the winner...........you just replied to a 9 year old thread. Heck..........you even beat my record by 2 years

    Find the appropriate forum for the tractor that you own. Please list your location, model and year of your tractor........then post the problem.

    You will get much faster responses and fixes this way.

    And welcome to TBN
    Don

    MF GC2400, FEL, 60in.MMM, 5ft. Cultivator, Single Bottom Plow, Bush Hog RTC48 tiller, MF 2360 front mount snowblower, 5ft backblade. BXpanded Piranha toothbar.

  9. #19
    Gold Member
    Join Date
    Apr 2009
    Posts
    257
    Location
    Texas
    Tractor
    Ford 3000

    Default Re: Smoking Battery Cables!

    What kind of tractor do you have?

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