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how to test if the heater inside the air dryer is working?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by TowHaul, Feb 7, 2020.

Page 2 of 2
  1. Feb 9, 2020 #11
    TowHaul

    TowHaul Medium Load Member

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    Mar 7, 2016
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    i would rather just run another line to it from a key on accessory. So is the test to turn the key on and use a test light? the wireharnass to the heater element in the dryer should have power at that point?
     
    Last edited: Feb 9, 2020
    TowHaul, Feb 9, 2020
    TowHaul, Feb 9, 2020
    #11
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  3. Feb 9, 2020 #12
    Working2party

    Working2party Medium Load Member

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    Feb 10, 2018
    Kansas
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    Yes the drier heater needs to see a nice bright test light using the power and ground at the plug.

    There is a thermostat intergraded in the heater element that can add a step to testing it. It will show open circuit at temps above I think 40 deg.
     
    Working2party, Feb 9, 2020
    Working2party, Feb 9, 2020
    #12
    Cabinover101 Thanks this.
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