Volvo VNL No power to Acc. Fuses 77-82

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by DaleTwilight, Apr 11, 2021.

  1. DaleTwilight

    DaleTwilight Bobtail Member

    4
    0
    Apr 11, 2021
    0
    I have an 06’ VNL Volvo and all of my accessory fuses, the complete right side column, aren’t getting any power. The power supply wire underneath the panel is properly secured visually but the wire itself has no voltage. I haven’t found a worthy diagram of power distribution or a common issue online.

    Any help or direction would be greatly appreciated. Maybe I have a power stud loose somewhere. Or a bad body module. Something..
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

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

  3. Inderjit

    Inderjit Light Load Member

    207
    242
    Sep 17, 2017
    0
    It may be powered by a virtual fuse in one of the modules.
    Disconnect the batteries for a few seconds and see if that
    fixes the problem.
     
  4. DaleTwilight

    DaleTwilight Bobtail Member

    4
    0
    Apr 11, 2021
    0

    Thanks for the advice here. Yesturday I removed all of the batterys for cleaning and inspection. Checked all the local fuses in that area and reinstalled. No improvement. What about Low Voltage Cut Off problems. Could that be an issue? Although the battery(s) voltage is healthy.
     
  5. Snailexpress

    Snailexpress Road Train Member

    2,242
    4,389
    Apr 28, 2014
    0
    Here is diagram for you. Check power relay.
    upload_2021-4-11_11-31-8.png
     
  6. DaleTwilight

    DaleTwilight Bobtail Member

    4
    0
    Apr 11, 2021
    0
    Snailexpress, You solved my mystery, friend! A previous repair shop must have removed fuse #52 which powers relay #21. That relay (#21) is responsible for the source power supply to the accessory power circuit(s). The drawing you provided is what I needed and I couldn't be more thankful for your help!

    By chance, do you have any other drawings you can supply me with. All that I've found online are (wildly) incorrect.

    Cheers and thank you again!
     
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

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

  • Draft saved Draft deleted