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07 t600 lost electrical power

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by cwyoung99, Apr 6, 2018.

  1. Apr 6, 2018 #1
    cwyoung99

    cwyoung99 Bobtail Member

    4
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    Feb 15, 2010
    0
    So I went to start my 07 t600 and it was cranking really slow. The batteries were getting old and truck has had to be jumped before so I opted to change them. Swapped them over and same thing slow crank. Well after cranking it I turned the key back to on and went to crank it one more time and lost all power to cab .... checked at fuse panel and seem to have no power there, headlights won’t even turn on.
     
    cwyoung99, Apr 6, 2018
    cwyoung99, Apr 6, 2018
    #1
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  3. Apr 6, 2018 #2
    Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    You have a bad connection somewhere. Did you clean and service all the battery cables and connections when you had them apart? Can't tell you how many times I see brand new batteries with cables that look like death and loose. Next go to the starter and check connections for power at main feeds to the cab too.
     
    Goodysnap, Apr 6, 2018
    Goodysnap, Apr 6, 2018
    #2
  4. Apr 6, 2018 #4
    cwyoung99

    cwyoung99 Bobtail Member

    4
    0
    Feb 15, 2010
    0
    Yes cleaned cables checked main power going to cab for fuse panel and have nothing ... checked breaker In battery box and has power on both sides I assumed a breaker or mega fuse or something was weak and went out causing no power to cab but cannot find anything other than the one in the battery box
     
    cwyoung99, Apr 6, 2018
    cwyoung99, Apr 6, 2018
    #4
  5. Apr 6, 2018 #4
    shogun

    shogun Road Train Member

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    Jan 23, 2009
    Doing a regen
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    Is there an in-line main fuse at the battery? I had one with a weak spot in it, truck wouldn’t crank when it was losing connection at the weak spot. If I wiggled it, it would crank. Just took it out, jumped the terminals across the fuse block and drove it to the dealer to buy another fuse. When the fuse wasn’t working, the truck was completely dead in the water, nothing worked.
     
    shogun, Apr 6, 2018
    shogun, Apr 6, 2018
    #4
  7. Apr 8, 2018 #5
    RET423

    RET423 Medium Load Member

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    Apr 6, 2017
    Kalifornia
    0
    If the main fuse in the battery box is good and all of your cables are clean and tight, the next item to check is the starter.

    The starter is hub for all cab power and the starter will drag with good batteries when it is failing.
     
    RET423, Apr 8, 2018
    RET423, Apr 8, 2018
    #5
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