Results 1 to 9 of 9
  1. #1
    New Member
    Join Date
    Oct 2011
    Posts
    3
    Tractor
    JD 5420

    Default Need wiring diagram 5420

    I need a wiring diagram for a 2003 JD5420 (Early Model, Straddle Mount)

    History:
    No Start, blown #D fuse,
    Fuel shot off solenoid is OK: I unplugged/disconnected it and tried to start = blown #D fuse.

    Suspected the relay (bottom right in fuse box). Replaced the relay...same thing....blown #D fuse.

    All I can find is the parts diagram with a picture of the wiring harness and the end connectors (to seat switch, PTO switch, tail lights, neutral switch, etc.)

    The short is not from the fuel shut off, but I don't want to have to isolate each it the connector on the harness to trace this thing. I don't want to burn that many fuses.


    I could REALLY USE a REAL wiring diagram of the rear wiring harness.

    Is such a thing available online? Or can some one fwd a copy?

    Thanks
    Philip-TX

  2. #2
    Super Star Member
    Join Date
    Aug 2001
    Posts
    11,496
    Location
    Upper Midwest USA
    Tractor
    JD 4300, JD X485 JD 4x2 Gator, JD 425, JD455

    Default Re: Need wiring diagram 5420


    One way I find to trace a short in the system is to rig up a 12v light bulb to slip into the fuse slot.
    Then when there is a short, the light bulb is on until the short is located and fixed.
    Cheaper than putting in new fuses.
    Sometimes just a wire that has rubbed the insulation off and causing the short. Moving wires around a bit helps to locate the short.

    I take the blown fuse and solder the two leads from a light socket to each side for the tester. There are other ways to test for the short. Sorry but don't have the wiring diagram for you.

  3. #3
    Platinum Member
    Join Date
    Sep 2010
    Posts
    593
    Location
    Virginia
    Tractor
    5210 MFWD

    Default Re: Need wiring diagram 5420

    I believe your problem is the temperature sensor. On the thermostat housing there is a temperature sensor that is connected to a two wire harness that goes to the injection pump; this is the "cold start advance" portion of the system so it starts easier when cold by advancing the timing.

    If you disconnect the sensor and it works fine ohm test the sensor, probably shorted.

    The sensor on the thermostat housing controls the advance on the injection pump. When it fails it shorts out and blows the fuel solenoid fuse. Try unplugging it, replace fuse and see if it starts and runs. The part # is RE503242, if you are quick changing it, you don't have to drain the coolant, just make sure it's not hot at the time. You will want a pan under the tractor to catch the coolant, so as not too have to clean it up.

    You may need to re-prime the fuel system, if it still does not start

    To comply with the exhaust emissions regulation, the timing of injection pump should be around 6? degrees before TDC. This timing values do not allow proper start-up operations when engine is cold. To ease engine start-up, a cold advance system gives to the injection pump a temporary over-timing.
    Last edited by JD5210; 05-05-2012 at 12:34 PM.

  4. #4
    Platinum Member JD 4520's Avatar
    Join Date
    Apr 2011
    Posts
    822
    Location
    Brinnon, WA
    Tractor
    John Deere 4520

    Default Re: Need wiring diagram 5420

    I learned something on this one...thanks for all the details. TBN members are great. Blessings to you...
    Gary

    JD 4520, 400X FEL, Frontier Front Blade, Box Blade, Rotary Cutter, Landscape Rake, 48" Wildkat Grapple and PHD

  5. #5
    New Member
    Join Date
    Oct 2011
    Posts
    3
    Tractor
    JD 5420

    Default Re: Need wiring diagram 5420

    beenthere,

    Thanks for the idea. I'll try the bulb thing. I like making those kinda gadgets.

    JD521,

    That is one of the circuits I plan on checking out. Guess I'll just trace the harness to all of the terminal ends, (neutral switch, fuse link, oil pressure, etc) and try to isolate each one. YUK!

    Do you know the ohm reading for the temp sensor?

    Is the temp senor a variable "resistance" "signal" or is it a switch?
    i.e normally open or normally closed? So I can do a continuity test.
    (things a wiring diagram should tell me)

    I'll be working on it his weekend (w/ limited internet access) and report back in case others have similar problems.

    Glad I found this place.
    Thanks again,

  6. #6
    Super Member
    Join Date
    Dec 2007
    Posts
    5,022
    Location
    Ohio
    Tractor
    JD 5520, 790 TLB-- Kub L4300, B7800, MX5100

    Default Re: Need wiring diagram 5420

    Quote Originally Posted by beenthere View Post

    One way I find to trace a short in the system is to rig up a 12v light bulb to slip into the fuse slot.
    Then when there is a short, the light bulb is on until the short is located and fixed.
    Cheaper than putting in new fuses.
    Sometimes just a wire that has rubbed the insulation off and causing the short. Moving wires around a bit helps to locate the short.

    I take the blown fuse and solder the two leads from a light socket to each side for the tester. There are other ways to test for the short. Sorry but don't have the wiring diagram for you.
    What a great idea.
    ******

    May I be the kind of person my dogs think I am,

  7. #7
    Platinum Member
    Join Date
    Sep 2010
    Posts
    593
    Location
    Virginia
    Tractor
    5210 MFWD

    Default Re: Need wiring diagram 5420

    Before spending a lot of time, I suggest you just disconnect the sensor and see, if it starts up. Last check the sensor is $31.24.

    The sensor is resistance, I do not know the range, but in testing you will most likely find there is not a range. I looked at tractordata.com and it said the 5420 is identical to the 5410. I looked at the manual (URL included) and I could see the wire for the sensor. I have included a wiring diagram for the 5210 thru 5510. Bad thing is the sensor does not show up on the wiring diagram. You may want to look at selectmanuals.com to purchase a copy of the manual, please note I have not purchased anything from them.

    http://manuals.deere.com/omview/OMRE199128_19/?tM=FR
    Last edited by JD5210; 05-05-2012 at 12:34 PM.

  8. #8
    New Member
    Join Date
    Oct 2011
    Posts
    3
    Tractor
    JD 5420

    Default Re: Need wiring diagram 5420

    Yea I'll be getting a service manual.

    This is just the first problem that came up where I needed one, and I am trying to get it fixed on short notice.

    Got the test light made and look fwd to using it this wknd, too.

    I made it with bullet connectors in-line so that it can be attached to different size fuses too, (either mini-fuses or the "little-bitty-mini" fuses).

  9. #9
    Elite Member Kyle_in_Tex's Avatar
    Join Date
    Oct 2002
    Posts
    4,044
    Location
    Giddings, Texas
    Tractor
    JD 4310,JD5420

    Default Re: Need wiring diagram 5420

    So I'm assuming you got it running Phillip?
    Men, don't wear boxer underwear if you have to mow a bumpy field, liberal men don't have to worry about this.

Similar Threads

  1. TN 65 wiring diagram?
    By gsxrsquid in forum New Holland Owning/Operating
    Replies: 24
    Last Post: 12-25-2012, 07:31 PM
  2. Anybody know the 1972 Hinomoto Combac?
    By jsw44 in forum General Vintage Tractors
    Replies: 16
    Last Post: 09-09-2010, 07:01 PM
  3. Kubota M4030 SU- Does anyone have a wiring diagram?
    By Braden in forum Kubota Owning/Operating
    Replies: 0
    Last Post: 08-08-2008, 09:52 PM
  4. Wiring diagram for trailer w/brakes?
    By offcamber in forum Trailers & Transportation
    Replies: 2
    Last Post: 05-12-2008, 01:42 PM
  5. B7610 Wiring Diagram - Dash lights
    By Stoweski in forum Kubota Owning/Operating
    Replies: 3
    Last Post: 12-18-2006, 05:58 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.