FJ40 Wire Harness Reference - September 1976

Discussion in '40- & 55-Series Tech' started by woytovich, Nov 5, 2010.

  1. woytovich

    woytovich Fake news SILVER Star

    Messages:
    11,873
    Media:
    2
    Albums:
    1
    Likes Received:
    1,173
    Joined:
    Sep 2, 2003
    Location:
    Metro NY
    I am in the process of doing some work on my 40 and I have the wiring harness out of the truck. I took this opportunity to photograph the harness in detail in the hopes of developing a useful wiring reference. (I have a MUCH larger version of this image also)

    I believe this to be an unmolested September 1976 wire harness. (thanks AntFJ for the clarification)
    I would like to identify each item on the harness, with additional details when necessary.

    Here is the picture. As you'll see each item is numbered... I would like to create a table cross referencing the numbers with their application and additional details. On the image I would like to add a short description to each item (in addition to the number.). The table will get posted here and updated as needed.

    Here is a large version of the below image (4.5mb):
    https://forum.ih8mud.com/media/1976-harness.51836/full?d=1487176685

    Here is a very large version:
    WireHarness9_76_lrg.jpg


    [​IMG]

    ############################################################

    NOTE: There is a 12/78 harness reference posted here:

    FJ40 Wire Harness Reference - December 1978

    ############################################################
     
    Last edited: Feb 15, 2017
    Matt1260 likes this.
  2. woytovich

    woytovich Fake news SILVER Star

    Messages:
    11,873
    Media:
    2
    Albums:
    1
    Likes Received:
    1,173
    Joined:
    Sep 2, 2003
    Location:
    Metro NY
  3. antFJ

    antFJ

    Messages:
    3,943
    Media:
    1
    Likes Received:
    622
    Joined:
    Jan 25, 2007
    Location:
    Lincoln, CA
    i can tell you right now that is either a really really really early 1978 or a late 77 the 78 did not have the fasten seatbelt/brake lights that mount under the dash and a horn relay... what MONTH/YEAR exactly is this harness from??

    (this is awesome btw)

    Below should be a good start on what you've got
     
    Last edited: Nov 6, 2010
  4. antFJ

    antFJ

    Messages:
    3,943
    Media:
    1
    Likes Received:
    622
    Joined:
    Jan 25, 2007
    Location:
    Lincoln, CA
    1. Alternator
    2. Alternator
    3. Passenger Headlight
    4. Passenger Horn
    5. Ground
    6. ?
    7. Ground?
    8. Pass Turn Signal
    9. Pass Turn Signal
    10. Oil Sender
    11. Coil?
    12. Coil?
    13. Washer Motor
    14. Fusible Link (goes to + Terminal on Battery)
    15. Fan Blower
    16. Rear Harness
    17. Rear Harness
    18. Distributor?
    19. Distributor?
    20. Starter
    21. Starter?
    22. Seatbelt Buzzer
    23. ?
    24. Radio Ground?
    25. Radio?
    26. Wiper Motor
    27. Wipor Motor
    28. Switch
    29. Dash Light
    30. Dash Light
    31. Switch
    32. Cig Lighter
    33. Temp Sensor
    34. Switch
    35. Below Dash Light (for heater controls)
    36. Rear Heater
    37. Column
    38. Column
    39. Column
    40. Annunciators
    41. Brake Switch?
    42. Parking Brake Switch?
    43. Alt Gauge
    44. Alt Gauge
    45. Cluster
    46. Parking Brake Switch?
    47. Headlight Switch
    48. Light Switch Light
    49. ??
    50. Computer
    51. Fuse box
    52. Ground
    53. Emissions s***
    54. ??
    55. Idle Solenoid on Carb
    56. Brake Pressure Switches on Master Cylinder
    57. ??
    58. Ground
    59. ??
    60. Drivers Horn
    61. Drivers Headlight
    62. Drivers Turn Signal
    63. Drivers Turn Signal
    64. ??
     
  5. woytovich

    woytovich Fake news SILVER Star

    Messages:
    11,873
    Media:
    2
    Albums:
    1
    Likes Received:
    1,173
    Joined:
    Sep 2, 2003
    Location:
    Metro NY
    Thanks for the info!

    Too many trucks taken apart, too many parts laying around: It was attached to a cowl with a VIN tag that says: SEP 1976
     
    Last edited: Nov 6, 2010
  6. Trollhole

    Trollhole THC Supporting Vendor Moderator

    Messages:
    20,917
    Media:
    79
    Albums:
    4
    Likes Received:
    2,955
    Joined:
    Mar 6, 2005
    Location:
    Mauldin, SC
    Very cool.
     
  7. zebrabeefj40

    zebrabeefj40

    Messages:
    3,310
    Likes Received:
    127
    Joined:
    Feb 19, 2004
    Location:
    Pepperell MA
    IMHO there is no reason to use a '78 harness over the '76. They are so close to being the same I wouldn't bother. 'Specially given the hybrid collection of parts that makes up your truck. Were this a correct resto the answer would be different. I would use the harness in best condition and carry on. Yer doin' too much thinkin' and not enough doin' on some of this stuff ya know. :p

    Not sure I would bother with "adapter harnesses" either. Just adds extra failure points to the electrical. Since it's not a resto there is no need to worry about maintaining the factory connectors. They are not weather tight and would even consider replacing some of them with newer GM WeatherPack or other weather resistent connectors. At least use heatshrinkable butt splices. But that would be the subject of a different thread...

    :cheers:

    Nick


     
  8. antFJ

    antFJ

    Messages:
    3,943
    Media:
    1
    Likes Received:
    622
    Joined:
    Jan 25, 2007
    Location:
    Lincoln, CA
    definitely man with what was said above - just modify this harness to suit your needs... i modified my 78' harness so that my early bib lights work as blinkers and parking lights - you can get all the connectors you want from Coolerman and it will still look clean and stock!

    a sept 76 makes perfect sense that looks exactly like the oct 76 truck i took apart cool to know!
     
  9. antFJ

    antFJ

    Messages:
    3,943
    Media:
    1
    Likes Received:
    622
    Joined:
    Jan 25, 2007
    Location:
    Lincoln, CA
    oh and 24 and 25 are the glove box plug

    and now that i look at it again 13 is the horn relay and 59 is your wiper motor
     
  10. woytovich

    woytovich Fake news SILVER Star

    Messages:
    11,873
    Media:
    2
    Albums:
    1
    Likes Received:
    1,173
    Joined:
    Sep 2, 2003
    Location:
    Metro NY
    I gotta do the thinkin'... I want to understand stuff, not just get it done. I've found that spending some time learning and thinking is worth the investment for me.

    I do however understand what you are saying and I am TRYING to balance the thinkin' vs doin' better...
     
    KFJ45 likes this.
  11. Coolerman

    Coolerman SILVER Star

    Messages:
    6,204
    Media:
    2
    Albums:
    1
    Likes Received:
    1,187
    Joined:
    Jan 5, 2004
    Location:
    Paint Lick, KY
    Great idea! Would you mind telling what software you used to stitch these pics together?

    So it's verified that this is a 9/76 harness? If so the following matched my 76 harness. These were verified with meter and schematic.... I updated your spread sheet also

    6 = RF Bypass capacitor
    7 = To Ballast Resistor
    10 = Coil +
    11 = Ground
    12 = To igniter
    21 = Starter Bypass
    23 = Buzzer Relay
    41 = Key Switch
    42 = Park Brake Switch
    43 = Amp Gauge
    44 = Amp Gauge
    46 = Turn Signal Flasher
    48 = Head Light Switch Bulb Socket
    49 = Interior light
    53 = Regulator
    54 = Washer Pump
    64 = Radio B+
     
    Last edited: Jan 17, 2011
    thebigredrocker likes this.
  12. Coolerman

    Coolerman SILVER Star

    Messages:
    6,204
    Media:
    2
    Albums:
    1
    Likes Received:
    1,187
    Joined:
    Jan 5, 2004
    Location:
    Paint Lick, KY
    If anyone is interested I can get a lot of the common latching connectors for the 73-83 harnesses.

    Some that are NOT available include the weird dizzy connectors, regulator connector, fuse block connector (though I may have a source for the terminals) Emissions computer connector, hazard switch connector and tail light connectors.

    Just email me what you need and I'll tell you if I can get them....
     
    DSB345 and thebigredrocker like this.
  13. woytovich

    woytovich Fake news SILVER Star

    Messages:
    11,873
    Media:
    2
    Albums:
    1
    Likes Received:
    1,173
    Joined:
    Sep 2, 2003
    Location:
    Metro NY
    Photoshop for the stitching... thanks for updating the spreadsheet...

    Mark
     
  14. 3doghouse

    3doghouse

    Messages:
    571
    Media:
    10
    Albums:
    5
    Likes Received:
    3
    Joined:
    Jan 22, 2008
    Location:
    Augusta, GA
    Thanks y'all, great reference.
     
  15. fj user

    fj user

    Messages:
    522
    Likes Received:
    0
    Joined:
    Apr 24, 2010
    Location:
    Savannah, GA
    very cool

    This is awesome. You have no idea how much time this just saved me! :beer::beer::beer:
     
  16. Hoz FJ40 CO

    Hoz FJ40 CO

    Messages:
    1,240
    Media:
    25
    Albums:
    1
    Likes Received:
    14
    Joined:
    Nov 10, 2010
    Location:
    Grand Rapids, MI
    Subscribed...I'm a couple weeks away from tackling this issue. Thanks for the info.
     
  17. Bennett

    Bennett

    Messages:
    627
    Likes Received:
    6
    Joined:
    Feb 1, 2002
    Location:
    Utah
    subscribed:
    Any idea what 57 is... thanks so much for posting this

    I got 2 76's and one has hacked up wiring..
     
  18. woytovich

    woytovich Fake news SILVER Star

    Messages:
    11,873
    Media:
    2
    Albums:
    1
    Likes Received:
    1,173
    Joined:
    Sep 2, 2003
    Location:
    Metro NY
    I will see if I can figure 57 out...

    I am SO glad this is proving helpful... :clap:

    I have gotten so much from the folks on mud it's nice to be able to give back in some tiny way.
     
  19. Rockets2000

    Rockets2000 Space Cadet

    Messages:
    614
    Likes Received:
    11
    Joined:
    Oct 11, 2010
    Location:
    Houston, TX
    57=washer motor?
     
    Drewk likes this.
  20. calsum2

    calsum2

    Messages:
    515
    Media:
    1
    Likes Received:
    68
    Joined:
    Apr 8, 2006
    Location:
    Chadds ford, pa
    This is a great resource...Thanks
     
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.