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Magic Smoke from 2018 400 converter cable.

pthomas745pthomas745 Moderator Posts: 4,167
in Battery/Electrical & Solar
Someone knows this, but I can't find any info.  This photo showed up on one of the FB groups this afternoon.
What is the white wire and where does it come from?
And, the fuses seem a bit off, especially the 7.5 amp ratings...this is from a 2018, so maybe the fuse setups I see in the "Tab 400" guide that is in the files from a couple of years ago are very different.
Is the cable here the 12V wire to the bus bar behind the converter?  Guessing from this thread below, simply based on the wire gauge.



2017 Outback
Towed by 2014 Touareg TDi
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Comments

  • Grumpy_GGrumpy_G Member Posts: 590
    I'd think so as well, in any case the other wire in that double terminal block looks pretty smoked as well. The block connects the converter to the rest of the trailer including the battery. Did the FB post state if that happened while plugged into shore power ?
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  • Yoshi_TABYoshi_TAB Member Posts: 477
    Hi,

    If you watch this video, it comes from the DC side of the converter.  About 13:50 point of the video.

    WFCO Power Source Training
    2025 360 CS (awaiting delivery)
    2021 TAB 320 BD (w/new owner having fun)
    2021 Jeep Grand Cherokee
    Southern Maryland
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  • Sharon_is_SAMSharon_is_SAM Administrator Posts: 9,863
    Did this involve a lithium battery?  
    Sharon / 2017 T@B CSS / 2015 Toyota Sienna Minivan / Westlake, Ohio
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  • MuttonChopsMuttonChops Member Posts: 1,772
    If one ZOOMs the above picture, the burnt White Wire is connected to a PCB Terminal Labelled NEG-.  It is the Power Center DC Voltage Ground and does connect to the trailer Ground Wires Bus.

    The thread in the link has pictures of 320S ground bus.
    And while we have limited 400 wiring reference material, several early year builds had the 400 Ground Bus on a wall panel behind the Power Center.

    I once Burned Out the white Battery to Ground Bus Wire on my 320S when I shorted the Battery Positive to chassis ground (with a wrench that slipped out of my hand).

    There has had to be some type of very high current short to cause the damage shown in the picture.

    Reference Picture:

    '18 320 S,  pitched axle, 3020HE; PNW based
    TV: '17 Colorado V6 Z71 4x4, Tow Package, GM Brake Controller
    Adventures:  56   Nights:  379  Towing Miles 47,220
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  • Yoshi_TABYoshi_TAB Member Posts: 477
    edited May 22
    Hi,

    If you look closely, is there a missing wire on the left of the two position lug bar?   Does  one wire  come from DC side of the converter (white wire on right) and the other connect  to the 12V ground bus (left position)?





    2025 360 CS (awaiting delivery)
    2021 TAB 320 BD (w/new owner having fun)
    2021 Jeep Grand Cherokee
    Southern Maryland
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  • pthomas745pthomas745 Moderator Posts: 4,167
    Thank you everyone, still waiting for answers to your questions from the owner.
    2017 Outback
    Towed by 2014 Touareg TDi
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  • Sharon_is_SAMSharon_is_SAM Administrator Posts: 9,863
    @Yoshi_TAB the wire on the left is fried, too.
    Sharon / 2017 T@B CSS / 2015 Toyota Sienna Minivan / Westlake, Ohio
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