Battery jumping

["Bruce Plecan" <nacelp@bright.net>]

Was in the cab of a pickup when a group 24 disassembled itself thru a spark
and H fumes, scared me, big time.  Happened during the twist of the key,
starter never hit (or couldn't hear it over the explosion).   Acid
everywhere, and plastic bits dented the hood.  Sooo, do be careful.
Grump


> I have been a professional jumper also pass 16 yrs. Would
> worry more about the dead jumped car than jumper vehicle,
> since cars were Euro models with $5000 computers.  Would use
> a deep cycle marine battery.  if not enough power to crank
> then
> run jumpers to marine battery in parallel.  Many cars
> especially 80's had warnings not to jump start and
> disconnect battery before using battery charger, but did not
> see any warnings about using vehicle to jump other cars.  I
> do not think I have ever
> turned off engine while connecting or disconnecting, I guess
> mainly to cold out.  I did witness(hear) a H2 battery
> explosion
> while connecting and seen a few Snap-On chargers die.
> Alex
> ----- Original Message -----
> From: Bruce Plecan <nacelp@bright.net>
> To: <gmecm@diy-efi.org>
> Sent: Monday, June 26, 2000 4:20 PM
> Subject: Re: Automotive Circuit Protection - Part 2
>
>
> > Corfuses me.  Worked at tow co.s for a long time, never
> shut em off to jump.
> > Years ago, so while the electonics for ecm wasn't there,
> was the older
> > gnerations of alternators.  granted the trucks had the big
> charging systems,
> > and huge batteries.  As I recall, we did all the cables
> with 00 wire.
> > Grumpy
> >    Speaking from the Peanut Gallery
> >
> >
> > > Very true, which is why I never start the vehicle that
> is doing the
> > > jumping, since it will be the one that takes the hit
> when pulling the
> > > jumper cable(s), when the starter disengages, or there
> happens to be a bad
> > > connection! BTW, that amount of load dump may well
> indicate a (small)
> > > battery problem.
> > >
> > > At 09:47 AM 6/26/2000 -0400, you wrote:
> > > >Hi Garfield, et al:
> > > > Ive measured loaddump WAY above 70V, here is the
> scenerio, jump starting
> > > a car.
> > > >Car A is running ~3000 rpm Vbat ~14.4, car B cranks
> draw the combined A
> > > and B
> > > >voltage down to ~9. Alternator is now pumping out Max
> power. When the
> > > starter
> > > >is released  on car B the alt in car A is still putting
> out max power,
> > even
> > > >with the battery I measured +186V.
> > > > I took the alt back to get it tested and was told that
> the magnetic
> > field
> > > takes
> > > >time to decay, AND there is a small delay before the
> regulator can
> > respond.
> > > >
> > > > Otherwise I agree with everything you've said
> > >
> > > Thanks,
> > >         Peter Hipson (founder, NEHOG)
> > >         1995 White NA Hummer Wagon
> >
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