Date: Wed, 31 Mar 2004 09:39:17 -0600

Author: Paul Nord

Subject: Re: jump start

Post:

I wouldn't think of this as a series vs. parallel thing. To really get
them in series you'd need to disconnect one terminal on each of the
batteries and use your jumper cables to complete the circuit. Then, of
course, you'd be putting 24V through the car's electrical system. That
would surely blow any light bulbs that were turned on. I wouldn't bet
on the survival of any electrical component.

When you connect the batteries + to - you are really shorting them out
through each other. They'll probably get very hot. They might even
explode.

Also, even if the dead battery has failed in such a way that it's a
completely open circuit (I don't think that this is likely), you'd be
putting the wrong polarity across the other car's electrical system.

As for recharging a dead battery, that probably depends on why it's
dead. If it died because you left the lights on, it may be run way
down. If it died because its cold and you had to try to start it a few
dozen times, it might not be so low. I'd think that driving around for
10 minutes should give it enough charge to start the next time.

However, if the battery is old and weak, drive immediately to your
local auto parts store and buy a new one. Don't shut off the engine
while you go inside.

Paul

On Wednesday, March 31, 2004, at 08:48 AM, Anthony Lapinski wrote:

> To jump start a dead battery, you are supposed to connect it to a good
> battery in PARALLEL (+ to + and - to -). Is it dangerous to connect the
> batteries in SERIES (+ to - and - to +), or would nothing happen? I've
> never tried this.
>
> And after being properly jumped, how long will it take for the
> alternator
> to "fully" restore the dead battery's charge?
>
From kmdudley@unity.ncsu.edu Wed Mar 31 10:44:17 2004

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