Fuse box Row Shutdown

Discussion in 'Volvo Forum' started by xiipercent, Oct 19, 2014.

  1. xiipercent

    xiipercent Medium Load Member

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    A new and fun twist to the ever growing Volvo fun

    Last night my 12v dash went out , left my phone uncharged...

    so,I pull out my fuse tester ( the one with alligator clip and probe with light)

    I test all fuse's under the dash cover, -

    this is what I found-


    F 77 12v power dash 20A
    F 78 Dome 10A
    F 79 CB power Stud 20A
    F 80 Battery protection status 15A
    F 82 12V Overhead 20A


    All fuse's with key to ON postion, no power to them (all fuses inspected and good) I even changed one of the 20A just to be sure.

    So, that is one whole row powerless. stumped.
     
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  3. Fajo

    Fajo The Dark Knight

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    Your first sentence explained the whole thread.
     
  4. Pablo-UA

    Pablo-UA Road Train Member

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    check battery protection unit (low voltage disconnect)
     
  5. xiipercent

    xiipercent Medium Load Member

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    Mar 19, 2007
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    Is that system on a relay?
     
  6. Pablo-UA

    Pablo-UA Road Train Member

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    it is control unit with built in heavy duty relay
    if voltage is lower 11.9 (22 V in EU) this unit disconnects row of sleeper/cab consumers till voltage is above 12.7V.

    This unit fails sometimes. Really volvo does not make it, it is outsorsing issue
     
  7. mecho57

    mecho57 Bobtail Member

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    Feb 9, 2008
    Clemson SC
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    Did you get this issue resolved? Where is this battery protection unit located? I am having the same problem with an 06 780.
     
  8. benrab

    benrab Medium Load Member

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    Depend of the built date of your truck up to now i know two different system (Low Voltage Disconnect) on Volvo Truck, look at the door jam LH sticker you will see the month and the year (built date) with that date i will be able to give you more accurate answer.
    Ben
     
  9. mecho57

    mecho57 Bobtail Member

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    Feb 9, 2008
    Clemson SC
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  10. benrab

    benrab Medium Load Member

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    Look in the tec tray where the fuses are located you will see a (tall relay) with a yellow sticker on the top, that relay is call Latching Relay even tought the terminal position look like a similar standard relay it's not.
    If you decide to replace it use the P/N on the yellow sticker. That relay is feeding the fuses involve with the Low Voltage Disconnect system (Battery Lifeguard).
    It is one possibility for your problem. . . .
    Let me know please.
    Ben
     
  11. mecho57

    mecho57 Bobtail Member

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    Feb 9, 2008
    Clemson SC
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    Thank You Ben, Local volvo dealer is closed on weekends. Will pick up relay next week and see. Will post result. Thanx for help.
     
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