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  1. #11
    Veteran Member brain55's Avatar
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    Jan 2008
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    Brentwood, CA

    Default

    Put one probe into each of the grey wires at the same time.

  2. #12
    Epic Contributor Soundguy's Avatar
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    Mar 2002
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    46,362
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    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: 1990 Kubota B20 charging problem

    probe the 2 grey wires with the 2 meter probes. set to AC votlage and you will read ac voltage. not current.

    I like taking 'loaded tests'. ( in circuit ) unloaded tests tell you MUCH less.

  3. #13
    Silver Member
    Join Date
    Aug 2009
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    230
    Location
    loganville ga
    Tractor
    wheel horse c-100

    Default Re: 1990 Kubota B20 charging problem

    on the kubota b20 you have a permanent magnet charging system not a dynamo or alternator per say this unit contains only north and south magnets and the conductor wires to make it work. they cannot be repaired and only put out about 11.50 to 12.50 voltage only enough to charge battery and possibly lights.
    if bought from dealer normally high side of $200.00 plus can be bought off ebay for a lot less as of today there is one on ebay for $103.00 just google your tractor year and model for alternator

  4. #14
    New Member
    Join Date
    May 2012
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    4
    Location
    Millers Creek
    Tractor
    Kubota B20

    Default Re: 1990 Kubota B20 charging problem

    I also have a charging problem with my B20 .... I have 17 VAC at the Dynamo. Bought a new Rectifier still no DC at the battery......Any ideas? Thanks Chuck

  5. #15
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
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    46,362
    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: 1990 Kubota B20 charging problem

    check voltage at input to regulator/rectifier...
    souNdguy

    sent from my NOKIA LUMIA

  6. #16
    New Member
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    May 2012
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    Location
    Millers Creek
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    Kubota B20

    Default Re: 1990 Kubota B20 charging problem

    That would be the blue wires right?

  7. #17
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
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    46,362
    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: 1990 Kubota B20 charging problem

    i don't own a kubota. I'm talking in general principles of electricity between a perm field dynamo and an external rectifier / regulator setup.
    souNdguy

    sent from my NOKIA LUMIA

  8. #18
    New Member
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    May 2012
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    Location
    Millers Creek
    Tractor
    Kubota B20

    Default Re: 1990 Kubota B20 charging problem

    17 volts at input to rectifier .... no DC out ... new rectifier....they're sending me another.

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