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  1. #1
    New Member
    Join Date
    Feb 2013
    Posts
    20
    Location
    Oklahoma
    Tractor
    1945 Farmall A & 1965 Ford 5000

    Default Problems with 1945 Farmall A charging system

    I just bought a 45 Farmall A and the previous owner put a 12 volt battery on it but didn't convert it. I put a 6 volt back on it but it still shows it discharging on the ammeter. Did the 12 volt knock out the voltage regulator and generator? Any advice?

  2. #2
    New Member
    Join Date
    Feb 2013
    Posts
    20
    Location
    Oklahoma
    Tractor
    1945 Farmall A & 1965 Ford 5000

    Default Re: Problems with 1945 Farmall A charging system

    Surely one of you out there can provide some advice. I hate to buy a VR if it's not needed. I'll try and get a multimeter on the generator today. Help!

  3. #3
    Elite Member
    Join Date
    Jul 2006
    Posts
    4,409
    Location
    Northwest, WA

    Default Re: Problems with 1945 Farmall A charging system

    Quote Originally Posted by Jerry Stevens View Post
    I'll try and get a multimeter on the generator today.
    Your going to have to, either that just start throwing new parts on it till it fixes itself.
    ::Sent from a standard desktop keyboard::

    My Photobucket

  4. #4
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    47,884
    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: Problems with 1945 Farmall A charging system

    rarely does adding a 12v battery kill it.

    in any case.

    polarize the genny ( jump bat hot to armature ) and then see what she does.

    use a volt meter.. remember .. an ammeter can read backwards if you have changed the ground polarity.

    a good test is to see if the needle deflects negative with ign on, points closed.. or lamp on, both with tractor not running.

    if metr shows negative deflection on those.. then it is liekly wired correct with respect to ground polarity.

    now.. if o charge after polarization do this:

    slip belt off machine.. jump bat to armature.. ground field.

    genny should spin. if not it needs a trip to the DR

    if it does spin.. then it should charge. most gens that motor, will charge. most gens that charge.. will motor.

    next.. assuming it motored..

    slip belt back on.. start up tractor.. nothing on meter?

    jumper field to ground.. if she starts charging.. but dies again when you remove jumper.. ensure wire harness from vrg to genny is intact. if it is.. vreg field circuit is bad... repalce vreg.

    if still no charge.. then jumper bat to arm as well as leaving field jumped to ground.

    if this produces charge, then cutout relay is open and field may be open as well in vreg.. etc.

    post back observations..

  5. #5
    Platinum Member
    Join Date
    Feb 2011
    Posts
    537
    Location
    Parish NY
    Tractor
    555DTC Farmall 200

    Default Re: Problems with 1945 Farmall A charging system

    It may be a coincidence, but on my Farmall 200 my 6v battery went down ( it was many years old) I put a 12v battery in it to start it. Ran it for a few weeks just starting with the 12v disconnecting the battery after starting and running it on the Genny. One day I left the battery hooked up and sure enough a bit later it stalled out. Took the genny and tested it and it tested fine the voltage reg was crapped out. I converted to 12v and could not be happier with my conversion.

  6. #6
    New Member
    Join Date
    Feb 2013
    Posts
    20
    Location
    Oklahoma
    Tractor
    1945 Farmall A & 1965 Ford 5000

    Default Re: Problems with 1945 Farmall A charging system

    Good stuff Soundguy! Thanks. Clint, I probably will but would like to see why it's not charging. Things to do after work and the weekend! Thanks all.

  7. #7
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
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    47,884
    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: Problems with 1945 Farmall A charging system

    post back.

    if the gennies good.. you are most of the way there..

  8. #8
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    47,884
    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: Problems with 1945 Farmall A charging system

    post back.

    if the gennies good.. you are most of the way there..

  9. #9
    New Member
    Join Date
    Feb 2013
    Posts
    20
    Location
    Oklahoma
    Tractor
    1945 Farmall A & 1965 Ford 5000

    Default Re: Problems with 1945 Farmall A charging system

    I checked the gen last night as you said and it motors. I believe it's the VR so have ordered a new one. More on this later. Thanks!

    Quote Originally Posted by Soundguy View Post
    rarely does adding a 12v battery kill it.

    in any case.

    polarize the genny ( jump bat hot to armature ) and then see what she does.

    use a volt meter.. remember .. an ammeter can read backwards if you have changed the ground polarity.

    a good test is to see if the needle deflects negative with ign on, points closed.. or lamp on, both with tractor not running.

    if metr shows negative deflection on those.. then it is liekly wired correct with respect to ground polarity.

    now.. if o charge after polarization do this:

    slip belt off machine.. jump bat to armature.. ground field.

    genny should spin. if not it needs a trip to the DR

    if it does spin.. then it should charge. most gens that motor, will charge. most gens that charge.. will motor.

    next.. assuming it motored..

    slip belt back on.. start up tractor.. nothing on meter?

    jumper field to ground.. if she starts charging.. but dies again when you remove jumper.. ensure wire harness from vrg to genny is intact. if it is.. vreg field circuit is bad... repalce vreg.

    if still no charge.. then jumper bat to arm as well as leaving field jumped to ground.

    if this produces charge, then cutout relay is open and field may be open as well in vreg.. etc.

    post back observations..

  10. #10
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    47,884
    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: Problems with 1945 Farmall A charging system

    post back if you need help, and good luck

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