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  1. #1
    Member
    Join Date
    Jul 2005
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    43
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    Vermont
    Tractor
    1979 Kubota B7100

    Default generator or voltage regulator trouble

    Hope someone out there can set me on the right path here. I have a case 580ck tractor with an alternator generator combined unit and a voltage regulator for the charging system. The battery has been draining down very slowly for sometime now and I finally did a system check with one of those battery and charging system meters. Seems that all I'm getting is about 12.5 volts and it's supposed to be in the 14.5 range. What I am wondering is how do I check just the generator and the voltage regulator separately to see which one is the problem? The generator had been rebuilt by the previous owner many years ago but thats all the information I have. Would rather not tear it all out if I do not have to like the rebuilt shop tells me to do so he can check both himself.

    Thanks for any help, Scott

  2. #2
    Silver Member
    Join Date
    Jul 2004
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    101
    Location
    Vermilion Ohio
    Tractor
    JD 4115 JD X300

    Default Re: generator or voltage regulator trouble

    Quote Originally Posted by furnacebrook View Post
    Hope someone out there can set me on the right path here. I have a case 580ck tractor with an alternator generator combined unit and a voltage regulator for the charging system. The battery has been draining down very slowly for sometime now and I finally did a system check with one of those battery and charging system meters. Seems that all I'm getting is about 12.5 volts and it's supposed to be in the 14.5 range. What I am wondering is how do I check just the generator and the voltage regulator separately to see which one is the problem? The generator had been rebuilt by the previous owner many years ago but thats all the information I have. Would rather not tear it all out if I do not have to like the rebuilt shop tells me to do so he can check both himself.

    Thanks for any help, Scott
    I'm not familiar with the Case 580ck. Do you have a generator or an alternator?? Makes a big difference concerning how you would troubleshoot the problem.

    Note: You could remove the alternator and bench test the unit at most auto parts store, for little cost if not for free.

  3. #3
    Silver Member
    Join Date
    Jan 2006
    Posts
    215
    Location
    Ontario Canada Lowbanks
    Tractor
    Kubota 1830 BX

    Default Re: generator or voltage regulator trouble

    My neighbour had one and it is a generator-starter motor combination
    When 12v is applied it turns as a starter,once running the voltage regulator senses current being generated and it feeds current into the system
    It should be tested
    Probably worn brushes
    Very easy to rebuild
    Check voltage regulator first
    Good luck
    DGS

  4. #4
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
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    49,066
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: generator or voltage regulator trouble

    Yuck.. i don't like the genny/starter combo's.. but.. i would deffinately start my check with the vr. Find out if that unit is a circuit or B circuit. with field wire disconnected at the genny, If A circuit, then you will read voltage between the F terminal and ground if you momentarilly apply power to the armature.

    If it is B circuit, then you will read 0v from field to ground when you momentarilly apply power to the armature.

    once you determine field type.. post back and I'll tell you how to test the reg...

    Soundguy

  5. #5
    Member
    Join Date
    Jul 2005
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    43
    Location
    Vermont
    Tractor
    1979 Kubota B7100

    Default Re: generator or voltage regulator trouble

    Ok.......... but it's not a starter/generator. There is a separate starter and then there is this generator that runs off of the fan belt. The guy at the rebuild shop asked me if it was a generator/alternator unit ? I don't have a separate alternator just this generator and a voltage regulator. I'm assuming there has to be all three for a charging system in one configuration or the other so maybe it is ? but I don't see anything on the generator that looks out of the ordinary. Would your test still work on this setup?

    Thanks to all of you for the replies, Scott

  6. #6
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    49,066
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: generator or voltage regulator trouble

    This is getting complicated by people using the wrong terminology..

    If it's a genny.. test it like I mentioned.

    If it's an alternator.. take it into a car parts store for a free test..

    Once you decide what it is.. then post back and I'll tell you how to motor test it, and then how to diagnose the vreg.. a or b circuit..

    soundguy

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