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Classic tachometer quit.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by askbob, Oct 23, 2010.

Page 2 of 2
  1. Oct 25, 2010 #11
    Bush chook

    Bush chook Light Load Member

    144
    43
    Apr 27, 2009
    Geelong
    0
    Pin K1 in the 30 pin vehicle harness connector
     
    Bush chook, Oct 25, 2010
    Bush chook, Oct 25, 2010
    #11
    askbob Thanks this.
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  3. Oct 25, 2010 #12
    Smalltruck

    Smalltruck Light Load Member

    141
    68
    Jul 3, 2010
    Elko, MN
    0
    This is the harness that runs from the engine to the truck. It supplies the data to the truck from the engine.

    If you took the truck to a shop and asked them to hook up the computer you could read the rpm at the ECM. If it doesn't work it may give you a better starting point for troubleshooting
     
    Smalltruck, Oct 25, 2010
    Smalltruck, Oct 25, 2010
    #12
    askbob Thanks this.
  4. Oct 25, 2010 #13
    askbob

    askbob Light Load Member

    213
    112
    Aug 16, 2010
    Bluegrass
    0

    My truck tachometer definitely runs straight from the ECM. I removed the 30 pin harness from the ECM and snugged up all of the female connectors inside the plug. It was a much more firm fit and I tightened up the small bolt accordingly. My tach went from not working at all, to working erraticly again. If I could find out which pin number on the cab side of that harness corresponds with K1 on the ECM side, I probably could narrow it down quite a bit. On a side note, I went over and checked and re-tightened any ground wires around the starter, alternator, and batteries. Everything looked good. Any suggestions?
     
    askbob, Oct 25, 2010
    askbob, Oct 25, 2010
    #13
  5. Oct 25, 2010 #14
    Bush chook

    Bush chook Light Load Member

    144
    43
    Apr 27, 2009
    Geelong
    0
    In the plug - 123 across the top - abcde down the side ( upper section ) fghjk on the lower section -K1 in the plug is the lower left pin wire No 505- on the ecm pin K1 goes to the lower rh pin as your looking at the ecm
     
    Bush chook, Oct 25, 2010
    Bush chook, Oct 25, 2010
    #14
    askbob Thanks this.
  6. Apr 7, 2016 #16
    Joe557512

    Joe557512 Bobtail Member

    2
    0
    Apr 7, 2016
    0
     
    Joe557512, Apr 7, 2016
    Joe557512, Apr 7, 2016
    #16
  7. Apr 7, 2016 #17
    Joe557512

    Joe557512 Bobtail Member

    2
    0
    Apr 7, 2016
    0
    Anyone know the tach code for a 2000 frieghtliner with a detroit?
     
    Joe557512, Apr 7, 2016
    Joe557512, Apr 7, 2016
    #17
  8. Aug 14, 2019 #17
    Oakcityarms

    Oakcityarms Bobtail Member

    32
    15
    Aug 6, 2019
    Oklahoma city
    0
    My 95 FLB detroit 60 DDEC II. i have a similar issue in that my tach is not working at all but i noticed i could tap the tach while driving and it would move and stick wherever it stopped.

    Any ideas??? I'll check the connections and ground wires tonight in a few minutes. Is there a fuse for the tach? Also as he asked a few times, which wire on the back of the tach is the feed wire???
     
    Oakcityarms, Aug 14, 2019
    Oakcityarms, Aug 14, 2019
    #17
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