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Re: [Shop-talk] Jump starting a late model car

To: Gene Garrison <gene@garrison-grafixx.com>
Subject: Re: [Shop-talk] Jump starting a late model car
From: Doug Braun <doug@dougbraun.com>
Date: Sat, 2 Dec 2023 11:14:05 -0500
Cc: shop-talk@autox.team.net
Delivered-to: mharc@autox.team.net
Delivered-to: shop-talk@autox.team.net
References: <510083893.2718443.1701382371753@myemail.cox.net> <bf47de2d-ae42-466a-9a86-4c4d03494b5d@protonmail.com> <e5384526-49a1-4fb2-bb8a-5df63705a81e@protonmail.com> <a2b4e839-63a1-4d53-8f95-b240316ee658@comcast.net> <a1f022a5-84fa-4d1c-afa3-73e2f9362e9f@garrison-grafixx.com>
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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=E2=80=AFPM Gene Garrison <gene@garrison-grafixx=
.com>
wrote:

> The BMS was my first thought.  In connecting to the battery posts to star=
t
> 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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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><div>An interesting topic!=C2=
=A0 I didn&#39;t realize how sophisticated these BMSes are.=C2=A0 I found a=
 video that explains the Ford version very well:=C2=A0 <a href=3D"https://y=
outu.be/I_KmO-KaR4A">https://youtu.be/I_KmO-KaR4A</a></div><div><br></div><=
div>Doug</div><div><br></div><br><div class=3D"gmail_quote"><div dir=3D"ltr=
" class=3D"gmail_attr">On Fri, Dec 1, 2023 at 1:35=E2=80=AFPM Gene Garrison=
 &lt;<a href=3D"mailto:gene@garrison-grafixx.com";>gene@garrison-grafixx.com=
</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">=
<u></u>

 =20
   =20
 =20
  <div>
    <p>The BMS was my first thought.=C2=A0 In connecting to the battery pos=
ts
      to start the car, you would be bypassing the BMS, so it wouldn&#39;t
      &quot;know&quot; about the charge and would think the battery was sti=
ll
      dead.=C2=A0 But this would have affected the Lexus (which had the dea=
d
      battery), not the F150.</p>
    <p>Other than that, I agree.=C2=A0 I can&#39;t think of any reason it w=
ould
      cause damage.=C2=A0 Just don&#39;t put the two batteries in series.</=
p>
    <p>- GeneG</p></div>
<br>
</blockquote></div></div>

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