Instrument cluster not working

Discussion in 'Peterbilt Forum' started by believe456, Jan 26, 2022.

  1. believe456

    believe456 Light Load Member

    185
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    Apr 22, 2015
    0
    Ok i have a an 06 379. When you open the door it displays mileage on dash. When you start truck the mileage and hours disappear and this is displayed - - - - - - - - - … air pressure gauges work fuel restriction gauge work fuel gauge work and voltage gauge works. All fuses are good relays appear to be good. Has anyone experienced this
     
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  3. kwcam

    kwcam Light Load Member

    173
    128
    Dec 29, 2012
    at the shop
    0
    Try cleaning the cab ground wire connection at the left front bottom corner, we have had strange gauge issues and when the ground was cleaned at both ends all went back to normal.
    Also an 06 does it have a Cat engine?, then there could be a break in the j1939 wiring that supplies eng data to the dash, check the yellow and green twisted pair where it comes out of the ecm plug, have seen a zip tie there rub the wires through.
     
  4. believe456

    believe456 Light Load Member

    185
    21
    Apr 22, 2015
    0
    Yes it’s a cat motor. So what happened was the blower knob was burnt out. When i pulled it out my dash worked intermittently. Then unplugged relay it’s got better then unplugged blower motor and it got better. Now it’s at 90% but still flickers I’m wondering what else can be tied into that
     
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