Page 1 of 2 12 LastLast
Results 1 to 10 of 13
  1. #1
    Silver Member
    Join Date
    Jan 2008
    Posts
    181
    Location
    Mount Pleasant, Texas
    Tractor
    Kubota L5460HSTC, Kubota RTV 900, JD Z655, JD 345, MM-BF

    Default 6 Volt generator to 12 volt?

    Does anyone know approximately what it would cost to rebuild a 6-volt DC generator to a 12-volt generator? My old 1950 B F Avery R/MM-BF was originally 6-volt positive ground and I have been running it on 12-volts positive ground for the past 20 years with the 6-volt generator disconnected. I'd been thinking about changing the generator to 12-volts and replacing the old 6-volt cutout with a 12-volt voltage regulator at the same time.

    If I replace the generator with an self-regulating alternator, I would have to change the system from positive ground to negative ground and I don't know how that would affect the positive ground starter. Will the starter run in reverse? Changing the ignition coil/distributor to negative ground isn't a problem for me.

    Rebuilding a generator will keep the tractor looking more like an original... except for the 12-volt battery in the battery box.


    Bill
    '14 Kubota L5460HSTC
    '06 Kubota RTV 900
    '12 JD EZ-Trak 655 w/54" HC Mower
    '99 JD 345 w/54" Mower
    '50 BF Avery R/MM BF

  2. #2
    Elite Member
    Join Date
    Sep 2010
    Posts
    4,088
    Location
    Canada
    Tractor
    MF

    Default

    It is about $120 if I remember. I decided to keep mine 6volt but looked into the 12 volt rebuild.

  3. #3
    Super Member
    Join Date
    Feb 2006
    Posts
    8,629
    Location
    VA
    Tractor
    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: 6 Volt generator to 12 volt?

    Quote Originally Posted by Retired Iron Peddler View Post
    Does anyone know approximately what it would cost to rebuild a 6-volt DC generator to a 12-volt generator? My old 1950 B F Avery R/MM-BF was originally 6-volt positive ground and I have been running it on 12-volts positive ground for the past 20 years with the 6-volt generator disconnected. I'd been thinking about changing the generator to 12-volts and replacing the old 6-volt cutout with a 12-volt voltage regulator at the same time.

    If I replace the generator with an self-regulating alternator, I would have to change the system from positive ground to negative ground and I don't know how that would affect the positive ground starter. Will the starter run in reverse? Changing the ignition coil/distributor to negative ground isn't a problem for me.

    Rebuilding a generator will keep the tractor looking more like an original... except for the 12-volt battery in the battery box.


    Bill
    I would think that just replacing the regulator with a 12V would do it. You would probably need a 1 or 2 Ohm power resister in the field exciter line.
    larry
    This side of 40
    JD2010, Kubota L3450/FEL w SK QC, L2550 w FEL
    Mahindra 7520 [Pinky] /FEL w Skid Steer QC/w Tilt Tatch & BH, BX1500 [Mighty Mouse]
    IH37 Baler, CCM165 Drum Mower, JD Rake
    JD 127 bushog, Flail, SK Tilt Tatch , KK tiller, Rhino rear blade, Post driver, post auger, chipper, pallet fork, Grapple/Loader Buddy, Homemade Splitter/DC Welder

  4. #4
    Silver Member droptop's Avatar
    Join Date
    Jan 2012
    Posts
    199
    Location
    Western NY
    Tractor
    Massey Ferguson 1635 cab

    Default Re: 6 Volt generator to 12 volt?

    You could get a 12V alternator that has an isolated ground meaning that the alternator housing is not connected to the negative terminal. Most small automotive alternators are case ground, the negative terminal is connected to the alternator housing so that it must be used with a negative ground system. If you are looking for an alternator, try a marine style alternator because a lot of them are isolated ground units that could be used in positive or negative ground systems.

  5. #5
    Silver Member
    Join Date
    Jan 2008
    Posts
    181
    Location
    Mount Pleasant, Texas
    Tractor
    Kubota L5460HSTC, Kubota RTV 900, JD Z655, JD 345, MM-BF

    Default Re: 6 Volt generator to 12 volt?

    Quote Originally Posted by SPYDERLK View Post
    I would think that just replacing the regulator with a 12V would do it. You would probably need a 1 or 2 Ohm power resister in the field exciter line.
    larry
    I don't follow what you are saying... just replace the 6-volt cutout with a 12-volt regulator? Isn't the armature and are field coils different in a 6-volt vs. a 12-volt generator?

    Bill
    '14 Kubota L5460HSTC
    '06 Kubota RTV 900
    '12 JD EZ-Trak 655 w/54" HC Mower
    '99 JD 345 w/54" Mower
    '50 BF Avery R/MM BF

  6. #6
    Gold Member Mighty Dodge's Avatar
    Join Date
    Jan 2007
    Posts
    499
    Location
    The Hereford Zone, MD
    Tractor
    JD 4200

    Default Re: 6 Volt generator to 12 volt?

    If your tractor has regulated 6 volt generator you can simply replace the 6 volt regulator with a 12 volt regulator. If it has a 3rd brush generator you'll need to adjust the 3rd brush so the generator puts out full voltage then wire in a 12 volt regulator. You'll also need to replace any 6 volt bulbs with 12 volt. If your tractor has a magneto no change to the ignition is necessary, however if it's coil you'll need to switch to a 12 volt coil or install a ballast resistor on the existing 6 volt coil.
    This will keep the tractor looking original. If you're not concerned with appearance you can simply install a 12 volt alternator and make the above changes to the bulbs and ignition.

    John
    2001 JD 4200, 420 loader, HF Quick Hitch, bucket boom, back blade, boom pole, forks, carry-all, moldboard plow, middle buster, receiver hitch, post hole digger.

    My Pics
    http://www.tractorbynet.com/photos/s...0/ppuser/33421

  7. #7
    Silver Member
    Join Date
    Jan 2008
    Posts
    181
    Location
    Mount Pleasant, Texas
    Tractor
    Kubota L5460HSTC, Kubota RTV 900, JD Z655, JD 345, MM-BF

    Default Re: 6 Volt generator to 12 volt?

    Quote Originally Posted by Mighty Dodge View Post
    If your tractor has regulated 6 volt generator you can simply replace the 6 volt regulator with a 12 volt regulator. If it has a 3rd brush generator you'll need to adjust the 3rd brush so the generator puts out full voltage then wire in a 12 volt regulator. You'll also need to replace any 6 volt bulbs with 12 volt. If your tractor has a magneto no change to the ignition is necessary, however if it's coil you'll need to switch to a 12 volt coil or install a ballast resistor on the existing 6 volt coil.
    This will keep the tractor looking original. If you're not concerned with appearance you can simply install a 12 volt alternator and make the above changes to the bulbs and ignition.

    John
    It may be a third brush generator since I remember my late father adjusted the brushes to raise the voltage for charging an 8-volt battery. I remember him saying at that time something like it couldn't be adjusted much higher. It doesn't have a regulator, only a cutout.

    I'll check for the third brush. There's an automotive electric (alternator, generator, starter) shop in town. When I have time, I may take in the generator and ask the older man who owns the shop if it can be changed, and if not, what it would take to change it.

    I understand the ignition coil and lamp bulb changes. I'm running it on 12-volts now, and have been probably for 10 years, with a 12-volt coil with a built in resistor. The starter and starter relay are still the 6-volt versions; however, I don't stay on them very long. The tractor engine starts almost instantly with very few turns of the crankshaft.

    Thanks,

    Bill
    '14 Kubota L5460HSTC
    '06 Kubota RTV 900
    '12 JD EZ-Trak 655 w/54" HC Mower
    '99 JD 345 w/54" Mower
    '50 BF Avery R/MM BF

  8. #8
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    48,804
    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: 6 Volt generator to 12 volt?

    Quote Originally Posted by Retired Iron Peddler View Post
    I don't follow what you are saying... just replace the 6-volt cutout with a 12-volt regulator? Isn't the armature and are field coils different in a 6-volt vs. a 12-volt generator?

    Bill

    YES they are different fields.

    around here.. 90$ gets a 6v converted to 12, if their are parts for it.

    otherwise adapt a common genny over. or go to alt.

    starter won't run backwards. series fields...

    3 brush adapt to 2 brush easilly...

  9. #9
    Silver Member
    Join Date
    Jan 2008
    Posts
    181
    Location
    Mount Pleasant, Texas
    Tractor
    Kubota L5460HSTC, Kubota RTV 900, JD Z655, JD 345, MM-BF

    Default Re: 6 Volt generator to 12 volt?

    Quote Originally Posted by Soundguy View Post
    3 brush adapt to 2 brush easilly...
    Are you saying if my 6-volt generator is a 3-brush, it will easily convert to a 12-volt 2 brush? How? By replacing the field coils? I don't intend to do this myself, but want to know in advance if the generator shop knows what they are suggesting?

    Thanks for the good info.

    Bill

    Bill
    '14 Kubota L5460HSTC
    '06 Kubota RTV 900
    '12 JD EZ-Trak 655 w/54" HC Mower
    '99 JD 345 w/54" Mower
    '50 BF Avery R/MM BF

  10. #10
    Super Member
    Join Date
    Feb 2006
    Posts
    8,629
    Location
    VA
    Tractor
    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: 6 Volt generator to 12 volt?

    Quote Originally Posted by Retired Iron Peddler View Post
    I don't follow what you are saying... just replace the 6-volt cutout with a 12-volt regulator? Isn't the armature and are field coils different in a 6-volt vs. a 12-volt generator?

    Bill
    The 12V gens Im familiar with were 2 brush. The field was fed by the regulator w enuf voltage/current to get ~ 14V off the armature. This reg fed voltage is way under 12V. Full 12V fed to the field would get you 30+V - and quite a bit of current from the armature. I did some welding with 3/32 rods using the field energized at 12V. Of course I would not recommend that ... you just need to get 14V at 10A or so to keep your 12V battery up. I think a 6V system designed like the one described would do this with a regulator change and maybe a lo value resistor in series with the field. Im not as confident with the positive to negative ground situation you also have.
    larry
    This side of 40
    JD2010, Kubota L3450/FEL w SK QC, L2550 w FEL
    Mahindra 7520 [Pinky] /FEL w Skid Steer QC/w Tilt Tatch & BH, BX1500 [Mighty Mouse]
    IH37 Baler, CCM165 Drum Mower, JD Rake
    JD 127 bushog, Flail, SK Tilt Tatch , KK tiller, Rhino rear blade, Post driver, post auger, chipper, pallet fork, Grapple/Loader Buddy, Homemade Splitter/DC Welder

Page 1 of 2 12 LastLast

Similar Threads

  1. 6 Volt Generator "TO" 6 Volt Alternator Conversion, Farmall M
    By Gary Farmall in forum Farmall Vintage Tractors
    Replies: 17
    Last Post: 12-13-2014, 04:38 PM
  2. JD 820 - 6 volt alternator on a 12 volt tractor?
    By glenhenshaw in forum John Deere Owning/Operating
    Replies: 35
    Last Post: 10-05-2011, 09:31 AM
  3. 12 Volt/24 Volt Battery Booster Box
    By penokee in forum Parts/Repairs
    Replies: 8
    Last Post: 06-30-2011, 01:31 PM
  4. 6 Volt Gator, 12 volt TSC spray pump ?
    By bcarwell in forum Parts/Repairs
    Replies: 17
    Last Post: 11-09-2010, 02:53 PM
  5. Switch Ford 640 to 12 volt? (6 volt now)
    By tillboy2001 in forum Ford Vintage Tractors
    Replies: 10
    Last Post: 03-31-2005, 03:02 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.