Page 1 of 2 12 LastLast
Results 1 to 10 of 16
  1. #1
    New Member
    Join Date
    Sep 2010
    Posts
    10
    Tractor
    new-holland 1720

    Default 1720 Alternator wiring problem

    Anyone have a color-coded wiring diagram for the alternator on a 1720? I discovered I don't have a warning light for the alternator. In my investigation it turns out that 2 wires in the wire bundle within inches of the alternator aren't terminated. A white red striped with brown spots wire that goes back to the light. A white with brown spots (no stripe) that goes to the "L" terminal on the Alternator.
    If I connect these, the light works perfect but the tractor won't stop running with the ignition switch off. The reason is that the "L" wire carries a constant 2 volt current when the alternator is spinning. This voltage bleeds back to the fuel stop solenoid and is just enough to keep it from shutting off.
    HELP! Thanks

  2. #2
    Elite Member JC-jetro's Avatar
    Join Date
    Jul 2006
    Posts
    3,096
    Location
    Kansas
    Tractor
    Ford 1700, Kubota MX-4700

    Default Re: 1720 Alternator wiring problem

    Quote Originally Posted by jnhelton View Post
    Anyone have a color-coded wiring diagram for the alternator on a 1720? I discovered I don't have a warning light for the alternator. In my investigation it turns out that 2 wires in the wire bundle within inches of the alternator aren't terminated. A white red striped with brown spots wire that goes back to the light. A white with brown spots (no stripe) that goes to the "L" terminal on the Alternator.
    If I connect these, the light works perfect but the tractor won't stop running with the ignition switch off. The reason is that the "L" wire carries a constant 2 volt current when the alternator is spinning. This voltage bleeds back to the fuel stop solenoid and is just enough to keep it from shutting off.
    HELP! Thanks
    Closest thing I have is for 1710. I don't know how close it is to 1720. It just might give your some clue. please look at the attached PDF.

    JC,
    Attached Files Attached Files
    Ford 1700, 2wd.
    Kubota MX-4700DT, Gear transmission with LA 884 loader, Q/A and HD bucket.
    60" Woods Rotary Cutter, home made (3-pt boom and a Row Hipper) ,King Kutter( 5 ft Tiller,Middle Buster,Single Row Cultivator,Carry-all, 5 ft blade, 6 ft Landscaping Rake ,30" Dirt Scoop and a 4'x4' Drag Harrow)

  3. #3
    Epic Contributor jinman's Avatar
    Join Date
    Feb 2001
    Posts
    20,950
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: 1720 Alternator wiring problem

    JC, it appears from your diagram that you have an external VR and the OP has a VR internally in his alternator from his description of the wires. Don't know. . .
    Jim


  4. #4
    New Member
    Join Date
    Sep 2010
    Posts
    10
    Tractor
    new-holland 1720

    Default Re: 1720 Alternator wiring problem

    Thanks to both of you. Didn't know this is the quick way to reply. Yes I have an internal VR. Can anyone say whether or not the 'L' terminal should be putting out the 2 volts constantly? Thanks

  5. #5
    Epic Contributor jinman's Avatar
    Join Date
    Feb 2001
    Posts
    20,950
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: 1720 Alternator wiring problem

    Jnhelton, I answered your PM. Without the diagram, I think there is an isolation diode missing, bypassed, or shorted. My tractor has an isolation diode to keep any postive voltage from feeding back and powering the bus through the light.
    Jim


  6. #6
    Elite Member JC-jetro's Avatar
    Join Date
    Jul 2006
    Posts
    3,096
    Location
    Kansas
    Tractor
    Ford 1700, Kubota MX-4700

    Default Re: 1720 Alternator wiring problem

    Quote Originally Posted by jinman View Post
    JC, it appears from your diagram that you have an external VR and the OP has a VR internally in his alternator from his description of the wires. Don't know. . .
    Yes Jim, You're right. I do have External VR on my 1700. The diagram I posted was for Ford 1710 rather than 1720. That was the closest thing I had on my IT FO-44. I thought it might help the OP some.

    JC,
    Ford 1700, 2wd.
    Kubota MX-4700DT, Gear transmission with LA 884 loader, Q/A and HD bucket.
    60" Woods Rotary Cutter, home made (3-pt boom and a Row Hipper) ,King Kutter( 5 ft Tiller,Middle Buster,Single Row Cultivator,Carry-all, 5 ft blade, 6 ft Landscaping Rake ,30" Dirt Scoop and a 4'x4' Drag Harrow)

  7. #7
    Epic Contributor jinman's Avatar
    Join Date
    Feb 2001
    Posts
    20,950
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: 1720 Alternator wiring problem

    Quote Originally Posted by JC-jetro View Post
    Yes Jim, You're right. I do have External VR on my 1700. The diagram I posted was for Ford 1710 rather than 1720. That was the closest thing I had on my IT FO-44. I thought it might help the OP some.

    JC,
    Well your diagram does show the light "L" lead from the external regulator. It's wired pretty much like mine and others with internal regulators, but I have an isolation diode after the light between it and the bus. I'm not sure of the symbology on your diagram, but I didn't see anything like that.
    Jim


  8. #8
    New Member
    Join Date
    Sep 2010
    Posts
    10
    Tractor
    new-holland 1720

    Default Re: 1720 Alternator wiring problem

    I'm betting you're right jinman. This isolation diode is in the internal IC circuit right? I think the original owner cut the wire rather than fix it!?

  9. #9
    Epic Contributor jinman's Avatar
    Join Date
    Feb 2001
    Posts
    20,950
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: 1720 Alternator wiring problem

    Quote Originally Posted by jnhelton View Post
    I'm betting you're right jinman. This isolation diode is in the internal IC circuit right? I think the original owner cut the wire rather than fix it!?
    I think you could put one inline. Just make sure the negative end is turned toward the alternator's "L" output. That way it will allow normal current to illuminate the light and isolate the circuit when the key is turned off.

    EDIT: I just changed the word above to "negative." I don't know what made me type positive the first time. Must be old age.
    Jim


  10. #10
    Gold Member
    Join Date
    Aug 2010
    Posts
    332

    Default

    Quote Originally Posted by jnhelton
    Anyone have a color-coded wiring diagram for the alternator on a 1720? I discovered I don't have a warning light for the alternator. In my investigation it turns out that 2 wires in the wire bundle within inches of the alternator aren't terminated. A white red striped with brown spots wire that goes back to the light. A white with brown spots (no stripe) that goes to the "L" terminal on the Alternator.
    If I connect these, the light works perfect but the tractor won't stop running with the ignition switch off. The reason is that the "L" wire carries a constant 2 volt current when the alternator is spinning. This voltage bleeds back to the fuel stop solenoid and is just enough to keep it from shutting off.
    HELP! Thanks
    There is a diode on that circuit, it is available through NH, PN SBA385620220

Page 1 of 2 12 LastLast

Similar Threads

  1. Boomer Problems
    By froggy in forum New Holland Owning/Operating
    Replies: 29
    Last Post: 03-21-2014, 02:29 PM
  2. B2400 starting problem finally solved
    By victor43 in forum Kubota Owning/Operating
    Replies: 47
    Last Post: 08-30-2013, 01:38 PM
  3. Power Steering Problem Not Solved
    By Alan L. in forum Kubota Owning/Operating
    Replies: 87
    Last Post: 03-31-2011, 06:35 PM
  4. Cub 1720 starter problem
    By jim burkett in forum Cub Cadet Tractors
    Replies: 2
    Last Post: 11-21-2007, 07:42 PM
  5. New BX 2200 Throttle Problem
    By Anonymous Poster in forum Kubota Owning/Operating
    Replies: 3
    Last Post: 06-02-2003, 10:23 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
  •  
© 2013 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.