Classic issue plz help

Discussion in 'Ask An Owner Operator' started by Classic29, Apr 29, 2022.

  1. Apr 29, 2022 #1
    Classic29

    Classic29 Bobtail Member

    8
    1
    Apr 28, 2022
    0
    Hey can someone please help me with voltage gauge and fuel gauge on my classic.
    1. Fuel gauge works fine if my fan is off but as soon as i turn my fan on fuel gauge starts falling off.
    2. Voltage gauge- it keeps on showing fluctuations between 12.5 to 13.9 or maybe hits 14 or above once in a while.
    I’m assuming maybe a short circuit or something somewhere. I just needs someone to point me in right direction or where to start from. (Detroit 2008 fully deleted) alternator wiring cleaned all the way. And motor has new sensor Harness and injector harness.
     
    Classic29, Apr 29, 2022
    Classic29, Apr 29, 2022
    #1
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Apr 29, 2022 #2
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

    9,738
    33,362
    Jan 20, 2010
    Hesperia, Ca.
    0
    Seen this same post somewhere else last night.
     
    Diesel Dave, Apr 29, 2022
    Diesel Dave, Apr 29, 2022
    #2
  4. Apr 29, 2022 #3
    Ridgeline

    Ridgeline Road Train Member

    22,752
    124,044
    Dec 18, 2011
    Michigan
    0
    Check your grounds
     
    Ridgeline, Apr 29, 2022
    Ridgeline, Apr 29, 2022
    #3
  5. Apr 29, 2022 #4
    Jed2009

    Jed2009 Light Load Member

    195
    573
    Jan 8, 2020
    Midwest
    0
    I think it’s the third thread on the same topic, different forums. OP have you considered just taking it in to the experts and pay to have it fixed? Shidd happens.
     
    Jed2009, Apr 29, 2022
    Jed2009, Apr 29, 2022
    #4
  7. Apr 29, 2022 #5
    pavrom

    pavrom Road Train Member

    3,223
    7,459
    Apr 29, 2012
    NE illinois
    0
    2. ...clean all you thick cables ...i had same thing after one month of new alternator , checked all my batteries ( one had to be replaced ) , cleaned all battery cables and felt like wow ...replaced battery connectors with volvo type as well
     
    pavrom, Apr 29, 2022
    pavrom, Apr 29, 2022
    #5
    Rideandrepair Thanks this.
  8. May 2, 2022 #6
    Classic29

    Classic29 Bobtail Member

    8
    1
    Apr 28, 2022
    0
    I already replaced battery connection with Volvo type Connectors and it shows 14.2 on batteries. But my problem is more likely just with dash gauges. Each gauge has 6 wire harness connecting all gauges in dash and ending up at speedometer. But I couldn’t seem to figure out ground cable out of these 6.
     
    Classic29, May 2, 2022
    Classic29, May 2, 2022
    #6
  9. May 3, 2022 #7
    Ridgeline

    Ridgeline Road Train Member

    22,752
    124,044
    Dec 18, 2011
    Michigan
    0
    Most likely they are multiplexed gauges.
     
    Ridgeline, May 3, 2022
    Ridgeline, May 3, 2022
    #7
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.