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Rear Rear Axle temp inop..ideas?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Hanadarko, Jul 3, 2010.

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  1. Jul 3, 2010 #1
    Hanadarko

    Hanadarko Independent Owner/Operator

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    My FWD REAR axle temp gauge was showing 125F and the REAR REAR gauge shows zilch. Even with the tandems locked, no change.

    So when I got home, I metered a few things:

    1. Rear Rear axle temp probe shows ~ 330omhs. So I know thats not 'open' and presumably able to do something.
    2. 11.8v at the wires and a good ground. So the probe has DC.

    Is it prudent to assume a bad dash gauge or how does one tell what to do or check next?

    :biggrin_25524:
     
    Hanadarko, Jul 3, 2010
    Hanadarko, Jul 3, 2010
    #1
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  3. Jul 3, 2010 #2
    bigkw

    bigkw Bobtail Member

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    I'm sure you checked already but mine quit working and it had come unplugged behind the dash gauge.
     
    bigkw, Jul 3, 2010
    bigkw, Jul 3, 2010
    #2
    Hanadarko Thanks this.
  4. Jul 3, 2010 #3
    Big Duker

    Big Duker "Don Cheto"

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    Just swap out the wires on two gauges and see if it does same thing. Tell you real quick and won't cost anything .
     
    Big Duker, Jul 3, 2010
    Big Duker, Jul 3, 2010
    #3
    Hanadarko and CondoCruiser Thank this.
  5. Jul 3, 2010 #4
    Hanadarko

    Hanadarko Independent Owner/Operator

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    Thanks guys!
    Nah, I havent had the dash apart YET...loose wire...sheesh..that would be my luck.
    I was going to try and swap the wires on each gauge next...

    Good ideas-
     
    Hanadarko, Jul 3, 2010
    Hanadarko, Jul 3, 2010
    #4
  7. Jul 3, 2010 #5
    droy

    droy Heavy Load Member

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    Would almost bet money one, or both of the wires are unplugged from send unit back of diff.
    Push / slide on connections, put back on, GENTLY tighten by crimping with pliers. May have to rig a backstop to prevent them from future unhooking. Send unit is usually protected by rectangular bracket, has holes for small screws; cut piece of plastic mud flap to stop the wires from backing off. Don't know why, front diff wires always come unhooked on my truck, rear wires just stay on.
     
    droy, Jul 3, 2010
    droy, Jul 3, 2010
    #5
  8. Jul 3, 2010 #6
    Hanadarko

    Hanadarko Independent Owner/Operator

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    Wires are good and snug on the sending unit. In fact, the ground wire is really on there. I took the center wire (after encouraging it) and it did come off, but goes back on with a good solid thunk...I think its making good contact. A pinch with a needle-nose might be a good idea too, but the feeling I got was it was a solid connection...

    :biggrin_25511:
     
    Hanadarko, Jul 3, 2010
    Hanadarko, Jul 3, 2010
    #6
  9. Jul 3, 2010 #7
    Powder Joints

    Powder Joints Subjective Prognosticator

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    Swap gauges. 5 minutes will have your answer
     
    Powder Joints, Jul 3, 2010
    Powder Joints, Jul 3, 2010
    #7
  10. Jul 3, 2010 #8
    CondoCruiser

    CondoCruiser The Legend

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    Smart man!

    I put my money on the sending units. They are more prone to go out rather than the gauges.
     
    CondoCruiser, Jul 3, 2010
    CondoCruiser, Jul 3, 2010
    #8
  11. Jul 3, 2010 #9
    Hanadarko

    Hanadarko Independent Owner/Operator

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    Well I would agree...but it is showing some OHM value. Who knows. Until it cools down outside (Sun AM) I am not going to play.

    90f and no shade..instant broil in and around the truck. :biggrin_25513:
     
    Hanadarko, Jul 3, 2010
    Hanadarko, Jul 3, 2010
    #9
  12. Jul 3, 2010 #10
    Smalltruck

    Smalltruck Light Load Member

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    Jul 3, 2010
    Elko, MN
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    If its a single wire unit the ground the wire out and gauge should go to the top. 2 wire unit then hook the wires together and gauge should go to the top. Gauge does not move then its either a bad gauge or wiring problem. Gauge moves then you have a bad sending unit. I dont remember what the resistance should be on the sending units so no help there
     
    Smalltruck, Jul 3, 2010
    Smalltruck, Jul 3, 2010
    #10
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