[Shop-talk] Jump starting a late model car

[Gene Garrison]

Yeah, I watched this video a few months back when I was replacing the 
timing chain and phasers on my 2012 F150.  Saw this thing hanging off 
the battery and wondered what it was.  Apparently they're really 
concerned that you have adequate battery juice to power things like 
electrically assisted power steering, auto stop/start, etc.  And will 
start turning off accessories if necessary.

I can't imagine that they would prevent the vehicle from restarting just 
because the computer thinks the battery is dead, but who knows.

- GeneG

On 12/2/23 08:14, Doug Braun wrote:
>
> An interesting topic!  I didn't realize how sophisticated these BMSes 
> are.  I found a video that explains the Ford version very well: 
> https://youtu.be/I_KmO-KaR4A
>
> Doug
>
>
> On Fri, Dec 1, 2023 at 1:35 PM Gene Garrison 
> <gene at garrison-grafixx.com> wrote:
>
>     The BMS was my first thought.  In connecting to the battery posts
>     to start the car, you would be bypassing the BMS, so it wouldn't
>     "know" about the charge and would think the battery was still
>     dead.  But this would have affected the Lexus (which had the dead
>     battery), not the F150.
>
>     Other than that, I agree.  I can't think of any reason it would
>     cause damage.  Just don't put the two batteries in series.
>
>     - GeneG
>
>
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