Cross jumped the battery

Discussion in 'Gen 4 Prius Technical Discussion' started by Jim Crahan, Nov 11, 2020.

  1. Jim Crahan

    Jim Crahan New Member

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    We accidentally cross jumped the battery. (Yeah, I’m an idiot and know better).

    I replaced the fusible link and battery and everything is still dead. No dash, cabin or exterior lights. I did hear something activate on the passenger side of the engine when I hooked the new battery up but that’s it. Except the horn works.

    2017 Prius Three Touring

    Any help on what I should look for?
     
  2. bisco

    bisco cookie crumbler

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    test the 12v health
     
  3. Jim Crahan

    Jim Crahan New Member

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    I replaced with new and it is fine.
     
  4. alanclarkeau

    alanclarkeau Senior Member

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    I assume it was the 12v you crossed? Have you checked all the fuses?

    It probably needs some diagnosis by an expert. I hope you haven't fried something expensive - which is a possibility.
     
  5. rjparker

    rjparker Senior Member

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    Usually people have blown other fuses in addition to the fusible link.
     
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  6. Jim Crahan

    Jim Crahan New Member

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    thanks!!! I went through them one by one today and found a few that were blown. (Uncomfortable messing with the ones by the emergency brake).

    Also found a 3-fuse block blown, 30a/30a/40a, and waiting for the part. Hopefully when I swap that one out I’ll be good to go.

    Thanks much to all for the feedback!!! (And for curbing the ‘knucklehead’ remarks. I’ve been jumping cars for almost five decades without incident and just lost attention this time. Costly reminder!)
     
  7. Jim Crahan

    Jim Crahan New Member

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    @rjparker ... TX Hill Country! I’m down here in Seguin.
     
  8. ChapmanF

    ChapmanF Senior Member

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    There's been a spate of those incidents lately.

    They're not all identical; different stuff might survive or get smoked. Sometimes expensive stuff, but sometimes not. Mostly takes patient poking around with a meter and the wiring diagrams until all the casualties are accounted for.

    Here's a recent thread you might want to follow along in to see how another real-life example worked out. Turned out to be nothing expensive in that one.
     
  9. rjparker

    rjparker Senior Member

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    We are just up the road NW of New Braunfels.
     
  10. Jim Crahan

    Jim Crahan New Member

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    Thanks @ChapmanF slow going but I have found other fuses blown. There is a 30/30/40amp bus/link that was blown. Replacement arriving tomorrow. That is the last of the fuses and hopefully the solution.
     
  11. Jim Crahan

    Jim Crahan New Member

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    @rjparker I miss my old air cooled VW. Ten wires, plenty of room and a comfortable sitting position while working on it.
     
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  12. alanclarkeau

    alanclarkeau Senior Member

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    Had 2 of them:
    1977 - AUTO with A/C!!! Had a few more wires by then.
    upload_2020-11-14_17-15-38.png

    And a '74 Manual before that.
     
  13. Mendel Leisk

    Mendel Leisk Senior Member

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    Just wondering: could a simple design change prevent this cascade of toasted fuses, links and (possibly) expensive components, in the event of crossed jumper cables? Or it's not practical/possible?
     
  14. ChapmanF

    ChapmanF Senior Member

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    Probably achievable for the right price, and the engineers had to decide if the cost is justified for preventing something that's kind of a user-inflicted problem.

    The only jumper cables I've had around for the last quarter-century or so were these:

    [​IMG]

    The LED in each half doesn't light unless the polarity's correct. You don't join the plugs until the LEDs glow. You're joining the plugs far away from both batteries, so you're not even fussing about finding a ground point away from the battery or making a spark when you connect it. Easy-peasy.

    I still have those down in the basement. It's a lithium-ion jump pack that lives in the car these days. Its cables also come with polarity detection, and won't let me jump anything backwards.
     
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  15. rjparker

    rjparker Senior Member

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    You buy one of the smart lithium jump boxes that won't energize in the wrong polarity or if there is absolutely no existing voltage. They measure existing to verify polarity before enabling the jump battery cells. A power diode reverse biased across the main feed might help in some cases (which is likely already in most existing circuits causing the blown fuses), however when someone puts a heavy duty battery on a prius it could overwhelm protection schemes and still blow ecms and parts.
     
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  16. Mendel Leisk

    Mendel Leisk Senior Member

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    Yeah I guess smart chargers and cables are the simplest route. I'm not sure my Clore JNC660 falls into that category.
     
  17. rjparker

    rjparker Senior Member

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    I think your unit is lead acid/agm based which is ok if left on its ac charger (assuming it is a good charger), but not so good for long term storage. A lithium jump model should maintain charge for a year or more making them better for in car storage. The lithium models have to have protection against shorts and polarity as they are much more volatile in the first place.

    There are some interesting 12v batteries available for primary lead acid replacements such as the Antigravity Restart models. They are lithium with an extra lithium jump start battery built in. All in the same form factor as the oem battery. Pricey but becoming popular in supercar applications where the car is left garaged for weeks on end. No battery tender needed.
     
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  18. Mendel Leisk

    Mendel Leisk Senior Member

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    Yeah Clore recommends to plug in for charging every 3 mos, and/or after use.
     
  19. mr_guy_mann

    mr_guy_mann Member

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    The fuses and fusible links ARE the "inexpensive" protection against cascading failures (and burning the car down).
    Too many electronic devices have capacitors, diodes, and other things that won't tolerate reversed polarity. Adding "smart" protection to each device (or the whole car) would add a lot of cost and complexity.
    For any given reverse polarity event, it's a question of whether the fuses go open before the high current damages anything permanently.

    Posted via the PriusChat mobile app.
     
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