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<p>I think someone is pulling someone else's leg. There is nothing
(that I know of) in any post-2000 vehicle that can be "fried" by
providing or accepting a jump, provide it's done properly (+ to +
and - to -).</p>
<p>The "dead" battery does not appear as a short because the cables
and clamps have significant resistance. That is the big reason
that the "dead" battery needs to be connected for a period of time
before cranking. (I usually wait 30 sec (longer in winter); not
very long, but it really doesn't take much to bring a dead battery
up to sufficient charge.)</p>
<p>The protections on vehicle electronics and electrical systems are
amazing; I've helped design and test quite a few of them.
Protection is built in to every component against: over-voltage;
reverse connection; shorts to ground; shorts to power. The battery
itself is a very simple electrochemical device that _can_ be
damaged, but it's difficult: freezing (-40F if charged; -20F if
significantly discharged); reverse charging; mechanical damage is
the most common problem.</p>
<p>Provided the jumper and jumpee batteries are connect properly (+
to + and - to -), there is almost no way to damage either of the
vehicles' systems.</p>
<p>Donald.<br/>
</p>
<div class="moz-cite-prefix">On 2023-11-30 17:12, JohnT Blair wrote:<br/>
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<blockquote type="cite" cite="mid:510083893.2718443.1701382371753@myemail.cox.net">
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<div class="default-style"> I come to the well of knowledge
looking for information. </div>
<div class="default-style"> </div>
<div class="default-style"> My sister just emailed me about her
having a friend jump start her late model Lexis from his F150
pickup. He got her started and then drove his truck to
someplace and parked it. When he tried to start it, it wouldn't
start. He had it towed to a dealership and they said his
battery was fried. </div>
<div class="default-style"> </div>
<div class="default-style"> In my sister's email she said that she
has found out that you shouldn't jump start a car made from 2000
on. </div>
<div class="default-style"> </div>
<div class="default-style"> My question is why and how do you
start a car with a dead battery? </div>
<div class="default-style"> </div>
<div class="default-style"> I realize that the jumping car should
be running, so that gives the possiblity of too much current
being drawn from the jumping car as it's got a good battery and
an alternator capable of putting out well over 100A! So the
jumped car's dead battery looks like a short circuit. Bad -
lots of current! </div>
<div class="default-style"> </div>
<div class="default-style"> So disconnecting the dead battery and
putting it on a battery charger to give it a more controlled
charge should be OK. </div>
<div class="default-style"> But that's not easy to do in a parking
lot. </div>
<div class="default-style"> </div>
<div class="default-style"> What about these jump boxes,
especially the little ones like </div>
<div class="io-ox-signature">
<p class="default-style"><a href="https://www.walmart.com/ip/NEXPOW-Battery-Jump-Starter-1500A-Peak-12800mAh-Car-Starter-up-7-0L-Gas-5-5L-Diesel-Engine-12V-Portable-Booster-Power-Bank-Box-LED-Light/534414164?adsRedirect=true" moz-do-not-send="true" class="moz-txt-link-freetext">https://www.walmart.com/ip/NEXPOW-Battery-Jump-Starter-1500A-Peak-12800mAh-Car-Starter-up-7-0L-Gas-5-5L-Diesel-Engine-12V-Portable-Booster-Power-Bank-Box-LED-Light/534414164?adsRedirect=true</a></p>
<p class="default-style">But that is supposedly capable of
1500A!!! </p>
<p class="default-style">I did a google search on the subject
and found an article talking about all the problems that you
can have doing this. But the article really didn't say if
these problems were to the jumping or the jumped car or both.</p>
<p class="default-style">So what is the collective knowledge
about this? What am I missing?</p>
<p class="default-style">JohnT,</p>
<p class="default-style"><br/>
<span style="font-family: tahoma, arial, helvetica, sans-serif;">John
T. Blair WA4OHZ email: <a class="moz-txt-link-abbreviated" href="mailto:jblair1948@cox.net">jblair1948@cox.net</a></span></p>
<div class="default-style"> Va. Beach, Va
Phone: (757) 495-8229 </div>
<div class="default-style"> </div>
<div class="default-style"> 65 Morgan 4/4 Series V (B1106)
75 Bricklin SV1 (#0887) 48 TR1800 48 #4 Midget </div>
<div class="default-style"> 65 & 77 Spitfire 71 Saab
Sonett III 65 Rambler Classic 65 Volvo P1800 </div>
<div class="default-style"> </div>
<div class="default-style"> Morgan: <a href="http://autox.team.net/morgan/" moz-do-not-send="true" class="moz-txt-link-freetext">http://autox.team.net/morgan/</a>
</div>
<div class="default-style"> Bricklin: <a href="http://www.bricklin.org/" moz-do-not-send="true" class="moz-txt-link-freetext">http://www.bricklin.org</a> </div>
<div class="default-style"> </div>
<p>If you can read this - Thank a teacher! <br/>
<span style="font-family: tahoma, arial, helvetica, sans-serif;">If
you are reading it in English - Thank a Vet!!</span></p>
<div class="default-style"> </div>
<p><span style="font-family: tahoma, arial, helvetica, sans-serif;">From
Dennis Prager - The American Trilogy:</span> <br/>
<span style="font-family: tahoma, arial, helvetica, sans-serif;">
e pluribus Unum, "from many, one."</span> <br/>
<span style="font-family: tahoma, arial, helvetica, sans-serif;">
In God We Trust</span> <br/>
<span style="font-family: tahoma, arial, helvetica, sans-serif;">
Liberty - the power of choosing, thinking, and acting
for </span> <br/>
<span style="font-family: tahoma, arial, helvetica, sans-serif;">
oneself; freedom from control or restriction </span> <br/>
<br/>
<br/>
</p>
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