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Tach and speedo quit working, low voltage

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by HoneyBadger67, Oct 28, 2019.

  1. Oct 28, 2019 #1
    HoneyBadger67

    HoneyBadger67 Road Train Member

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    09 t660, cummins engine
    Driving down the road, all systems normal, all of a sudden tach and speedo quit working and low voltage pops up on RoadRelay. All other gauges continue working and engine stays running with throttle response.
     
    HoneyBadger67, Oct 28, 2019
    HoneyBadger67, Oct 28, 2019
    #1
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  3. Oct 28, 2019 #2
    stillwurkin

    stillwurkin Road Train Member

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    Little late reresponding. Been busy. I had that happen on my old 93 pete, and it was a hot wire that connects down by the starter. It had corroded off. Have you tried disconnecting batteries, kinda like letting it reset? If you can, and get it fixed, please let us know what it was.
     
    stillwurkin, Oct 28, 2019
    stillwurkin, Oct 28, 2019
    #2
  4. Oct 28, 2019 #3
    HoneyBadger67

    HoneyBadger67 Road Train Member

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    Savannah, TN
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    Am trying to limp to kenworth to get a cable. Should have it on in a couple hours, maybe
     
    HoneyBadger67, Oct 28, 2019
    HoneyBadger67, Oct 28, 2019
    #3
    stillwurkin Thanks this.
  5. Oct 28, 2019 #4
    HoneyBadger67

    HoneyBadger67 Road Train Member

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    Update...
    Starter 'bumps' when ignition is switched to ON but not turned to START.
     
    HoneyBadger67, Oct 28, 2019
    HoneyBadger67, Oct 28, 2019
    #4
    stillwurkin Thanks this.
  7. Oct 28, 2019 #5
    Ridgeline

    Ridgeline Road Train Member

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    Bad ground.

    This has been a problem with a group of my trucks I acquired, they all had the same issue and everyone of them has a bad ground somewhere,
     
    Ridgeline, Oct 28, 2019
    Ridgeline, Oct 28, 2019
    #5
    HoneyBadger67 and stillwurkin Thank this.
  8. Oct 29, 2019 #6
    HoneyBadger67

    HoneyBadger67 Road Train Member

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    One badly frayed positive and a slightly worn through ground managed to fry the alternator causing it to overcharge. Much wampum later and the truck SEEMS to be doing ok, holding at a steady 14.15 - 14.2.

    While I hate going to the dealership for things I should be able to do myself, lying on the wet ground in 45° weather looking for worn cables sounded like a path to pneumonia.
     
    HoneyBadger67, Oct 29, 2019
    HoneyBadger67, Oct 29, 2019
    #6
    speedyk and stillwurkin Thank this.
  9. Oct 29, 2019 #7
    BRD TRANSPORT

    BRD TRANSPORT Light Load Member

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    I had same problem,Replaced speed sensor on trans still nothing.
    Took truck to shop and they tightend up yoke nut to spec. and they started working .
    Still flutyers slightly on speedo ,they say rebuild back half of tranny.
    Good luck
     
    BRD TRANSPORT, Oct 29, 2019
    BRD TRANSPORT, Oct 29, 2019
    #7
  10. Oct 29, 2019 #8
    speedyk

    speedyk Road Train Member

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    The regulator was likely overcharging because of the cable resistance, the alternator probably didn't enjoy that very much.
     
    speedyk, Oct 29, 2019
    speedyk, Oct 29, 2019
    #8
    HoneyBadger67 Thanks this.
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