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No good deed goes unpunished... charging system fault

Discussion in 'LR4' started by DiscoLR, Feb 27, 2021.

  1. DiscoLR

    DiscoLR Member

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    Good morning guys,
    Last night, there was a car next to my LR4 that needed a jump. I gladly offered to help, and the ding bat connected the leads to his car(after I told him to just hold them), and there was a small puff of smoke from my positive battery terminal. I immediately pull my leads, but at this point, I knew it was too late(as well as he, based off my facial expression). Lo and behold, CHARGING SYSTEM FAULT. At this point, I stress to him to just HOLD the leads. I jump started his car, and preceeded home(hoping I'd make it). Drove 30 mins, about 25 miles, with no issue(other than the fault light). Drove it again, for about 20 min local, getting drive thru. No issues. Before I start messing with it, anyone have an idea on what I fried? Any help is appreciated.
     
  2. DaytonaRS7

    DaytonaRS7 Full Access Member

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    iid tool?
    Pull the codes.
     
  3. Michael Gain

    Michael Gain Full Access Member

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    BMS module will give you the same fault. Check the connector on the negative terminal to see if it was dislodged.

    Otherwise, yes, as @DaytonaRS7 said, you're going to need to read the codes.
     
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  4. DiscoLR

    DiscoLR Member

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    Found the culprit. It seems to be the signal wire that runs from the top of the positive to the bms. It looks like it has 2 fusable links on it. Any idea where to source a new one, or what amps they are? I can just run an external fuse for now.
     
  5. mbw

    mbw Full Access Member

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    I killed an alternator jumping someone. I will only use battery jump packs now for that. Just too many things to go poof with jump cables.
     
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  6. DiscoLR

    DiscoLR Member

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    Yes, I will no longer be jumping anyone outside my family. Even then, I'll make sure they don't touch anything.
     
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  7. DaytonaRS7

    DaytonaRS7 Full Access Member

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    about 15years ago i needed a jump. i was in a parking lot and asked a person who just parked near me. he was hesitant said that there were too may "computers and stuff that could go wrong" and turned me down. I was annoyed and sad that he wouldn't help.

    I now completely understand his concerns, and would most likely do the same.
     
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  8. mbw

    mbw Full Access Member

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    Ya, I always carry one of these both for my own backup on trips/off grid and also so I can help people out. I don't spend so much on a capable rig to turn people down and not help.

    [​IMG]
     
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