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Peterbilt tachometer issue

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 2006gmcdmax, Jun 27, 2018.

  1. Jun 27, 2018 #1
    2006gmcdmax

    2006gmcdmax Light Load Member

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    i have a 96 357 the tach used to work then it wouldn’t then it would. Anyways when it stoped you could bump it and it would go to working. When you shut the truck off it go to 2500 when turn it on it goes below zero so it’s getting power. Any advice here?
     
    2006gmcdmax, Jun 27, 2018
    2006gmcdmax, Jun 27, 2018
    #1
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  3. Jun 28, 2018 #2
    W900AOwner

    W900AOwner Heavy Load Member

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    You'll be best off to open the dash and access the back of the tach with a tester to check for continuity back to the sending unit first, to see if the wires are OK. At that point if they are OK I'd be looking at the tachometer head itself gone bad.
     
    W900AOwner, Jun 28, 2018
    W900AOwner, Jun 28, 2018
    #2
  4. Jun 28, 2018 #3
    2006gmcdmax

    2006gmcdmax Light Load Member

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    Can you rebuild them or what actually goes bad
     
    2006gmcdmax, Jun 28, 2018
    2006gmcdmax, Jun 28, 2018
    #3
  5. Jun 28, 2018 #4
    kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    I think I remember @blairandgretchen having a problem with his tach sometime back.
     
    kemosabi49, Jun 28, 2018
    kemosabi49, Jun 28, 2018
    #4
    blairandgretchen Thanks this.
  7. Jun 29, 2018 #5
    W900AOwner

    W900AOwner Heavy Load Member

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    I'd just get a new one from Pete.
     
    W900AOwner, Jun 29, 2018
    W900AOwner, Jun 29, 2018
    #5
    2006gmcdmax Thanks this.
  8. Jun 29, 2018 #6
    2006gmcdmax

    2006gmcdmax Light Load Member

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    It’s crazy I mean you could barely tap it and it would go right to working no issue
     
    2006gmcdmax, Jun 29, 2018
    2006gmcdmax, Jun 29, 2018
    #6
  9. Jun 29, 2018 #7
    blairandgretchen

    blairandgretchen Road Train Member

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    blairandgretchen, Jun 29, 2018
    blairandgretchen, Jun 29, 2018
    #7
    W900AOwner Thanks this.
  10. Jul 5, 2018 #9
    lowlife

    lowlife Bobtail Member

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    Feb 21, 2017
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    Most likely the solder broke on the plug going into tach. Mine would do the same thing, ended up cutting the tach in half resoldered and gorilla taped it back together.
     
    lowlife, Jul 5, 2018
    lowlife, Jul 5, 2018
    #9
    Oxbow and blairandgretchen Thank this.
  11. Jul 12, 2018 #9
    RocketScott

    RocketScott Medium Load Member

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    Same here.

    I took the time to pry the bezel open on the back side. Ended up breaking the glass. Local glass shop cut a new piece for $10. Quick solder job and carefully tap the bezel closed with a punch and small hammer.
     
    RocketScott, Jul 12, 2018
    RocketScott, Jul 12, 2018
    #9
    blairandgretchen Thanks this.
  12. Jul 13, 2018 #10
    blairandgretchen

    blairandgretchen Road Train Member

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    I might hack into the old one and see if I can repair it - may cut bezel with a dremel instead.
     
    blairandgretchen, Jul 13, 2018
    blairandgretchen, Jul 13, 2018
    #10
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