Page 1 of 3 123 LastLast
Results 1 to 10 of 25
  1. #1
    Member
    Join Date
    Oct 2005
    Posts
    45
    Location
    Central MA
    Tractor
    Ford 1920

    Default Ford 1920 alternator output

    Having electrical problem with Ford 1920.....see http://www.tractorbynet.com/forums/p...l-trouble.html I checked for more mice chewed wires....couldn't find any. When I turn the key to "on" it blows the fuse for the "quick start timer and voltage regulator circuit." I disconnected the timer, blew another fuse.

    I then took some voltage readings:
    tractor off, battery voltage: 12.5v
    tractor running, lights off, battery voltage: 12.2
    tractor running, all lights on, battery voltage: 11.95
    tractor running I got the same readings at the alternator.
    From what I've read, the voltages with the tractor running at 1500rpm seem low. What should the output be at the alternator?

    Since the voltage regulator is internal to the alternator, can an electrical novice (me) test it?
    Would a defective regulator cause the fuse to blow, since that particular fuse protects the voltage regulator circuit?

    Any and all help apprecuiated.

    Bob
    Last edited by MA1920; 11-25-2012 at 09:12 PM.

  2. #2
    Veteran Member Hooked_on_HP's Avatar
    Join Date
    Dec 2005
    Posts
    2,043
    Location
    Coal City IL
    Tractor
    Ford 1900 FWD Kubota F2100E

    Default Re: Ford 1920 alternator output

    Most auto parts stores will check your alt/reg. Take it off and take it in. If it is bad find a shop that repairs alternators or you can get one on ebay for$83. A replacement from N/H is $234.
    Bill

  3. #3
    Elite Member JC-jetro's Avatar
    Join Date
    Jul 2006
    Posts
    3,192
    Location
    Kansas
    Tractor
    Ford 1700, Kubota MX-4700

    Default Re: Ford 1920 alternator output

    You might have issue with the rectifier bridge that changes AC to DC. As Bill said any Auto parts store can bench test your alternator for free. Just need to take Alternator off the tractor and take it to them.

    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)

  4. #4
    Member
    Join Date
    Oct 2005
    Posts
    45
    Location
    Central MA
    Tractor
    Ford 1920

    Default Re: Ford 1920 alternator output

    After work tomorrow I'll take off the alternator and head to AutoZone.

  5. #5
    Member
    Join Date
    Oct 2005
    Posts
    45
    Location
    Central MA
    Tractor
    Ford 1920

    Default Re: Ford 1920 alternator output

    After having the alternator tested at Auto Zone, it's good. The regulator and rectifier passed. If the alternator is good, why do my voltage readings seem off? If the tractor's running and I disconnect the negative or positive battery cable, will that prove anything?

    Bob

  6. #6
    Elite Member JC-jetro's Avatar
    Join Date
    Jul 2006
    Posts
    3,192
    Location
    Kansas
    Tractor
    Ford 1700, Kubota MX-4700

    Default Re: Ford 1920 alternator output

    Bob,

    That's good news. If you have bad connection then the resistance will go up in part of the circuit causing low voltage reading. You might also need to verify the calibration on your meter. Do you have another meter or can borrow a meter from someone else. It might be that your meter is giving you bad reading. Tractor will continue running if you take leads off the battery and that proves nothing. obviously you will not have lights.

    JC,


    Quote Originally Posted by MA1920 View Post
    After having the alternator tested at Auto Zone, it's good. The regulator and rectifier passed. If the alternator is good, why do my voltage readings seem off? If the tractor's running and I disconnect the negative or positive battery cable, will that prove anything?

    Bob
    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
    Veteran Member Hooked_on_HP's Avatar
    Join Date
    Dec 2005
    Posts
    2,043
    Location
    Coal City IL
    Tractor
    Ford 1900 FWD Kubota F2100E

    Default Re: Ford 1920 alternator output

    Try unhooking your glow plugs or the timer. I wonder if the glow plugs are staying on .
    Bill

  8. #8
    Member
    Join Date
    Oct 2005
    Posts
    45
    Location
    Central MA
    Tractor
    Ford 1920

    Default Re: Ford 1920 alternator output

    Bill And JC, thanks for your continued help. I did disconnect the glow plug timer and the fuse still blows. The fuse only blows when the instrument panel is connected to the main wire harness. The circuit board and instrument harness are new because the mice chewed some wires. The fuse that keeps blowing protects the "quick start timer and alternator regulator circuit." Since the alternator checked out ok, it's time to concentrate on the quick start timer circuit.

    According to my service manual, the ignition quick start system is composed of the glow plugs, glow plug indicator lamp and timer relay. With the timer disconeccted the fuse popped, so the timer must be good.
    The service manual has a more detailed procedure to check the glow plugs, relay and indicator lamp, but to test the circuit I have to turn the key to the "heat" position. As soon as I turn the key to "heat" or "run", pop goes the fuse. I'm lost. Any advice and direction greatly appreciated. Thanks again.

    Bob

  9. #9
    Epic Contributor
    R.I.P.
    jinman's Avatar
    Join Date
    Feb 2001
    Posts
    21,014
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: Ford 1920 alternator output

    Bob, I've noticed that NH seems to wire the glowplug circuits in a similar manner. That said, the glow plugs on my TC45D get current from the main 40 amp fuse only. The timer controls how long the glow plug relay is energized. When the glow plug relay contacts close, they complete the path for glow current directly from the 40 amp Main fuse. It doesn't even go through the ignition switch. Technically, with the glow plug timer pulled, there is no way to energize the glow plug relay. If your relay is energized and powering the glow plugs with the timer removed, there is a wiring error I believe.

    I wish I had a schematic for your tractor because I think I could point you in the right direction. My TC45D does not have a preheat position on the key switch. The glow plugs just automatically cycle each time the switch is turned from off to on. I don't want to mislead you, but that's how the glow plugs operate on my tractor.
    Jim


  10. #10
    Member
    Join Date
    Oct 2005
    Posts
    45
    Location
    Central MA
    Tractor
    Ford 1920

    Default Re: Ford 1920 alternator output

    Quote Originally Posted by jinman View Post
    ...I wish I had a schematic for your tractor because I think I could point you in the right direction....

    Jim, what's the old saying? "Be careful what you wish for...." My service manual covers the 1920 and 2120. The wiring diagram for the 2120 has the color code, so I've been trying to match colors to the 1920 diagram. I hope it helps.

    Bob
    Attached Thumbnails Attached Thumbnails -img_0003-jpg   -img-jpg  

Page 1 of 3 123 LastLast

Similar Threads

  1. 4300 alternator output
    By defed in forum John Deere Owning/Operating
    Replies: 3
    Last Post: 11-16-2011, 08:31 PM
  2. B26 Alternator output
    By digger2 in forum Kubota Owning/Operating
    Replies: 7
    Last Post: 11-28-2007, 07:26 PM
  3. Alternator output on #4110
    By joes_427_vette in forum John Deere Owning/Operating
    Replies: 6
    Last Post: 12-28-2005, 05:40 PM
  4. Alternator output
    By hosejockey2002 in forum Yanmar
    Replies: 11
    Last Post: 11-15-2002, 12:49 AM

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.