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From: Kev on 7 Jul 2010 03:26
John_H wrote:


> With jumper leads I always disconnect the positive first and fasten
> the positive clamp back along the cable so there's no risk of shorting
> the jumper terminals before you disconnect the donor battery. If you
> do it the other way (negative first) and there's a common earth
> between vehicles (ie if they're touching one another) you'll short
> both batteries if you happen to contact metal with the negative jumper
> clamp while the positives are still connected.


HMMM
if you contact the negative cable to the common earth nothing will
happen, but if you happen to contact the Positive lead to the common
earth you create a short

Although I'm not in the habit of crashing into the car I'm about to jump
start to create a common earth, but if you happen to drop the positive
cable once disconnected and it comes in contact with either car body you
have a common earth through the negative cables still connected you
create a short

disconnect the ngative on the flat battery, then the positive, then
disconnect the negative then positive on the good battery


Kev
From: John_H on 7 Jul 2010 03:27
John_H wrote:
>
>With jumper leads I always disconnect the positive first and fasten
>the positive clamp back along the cable so there's no risk of shorting
>the jumper terminals before you disconnect the donor battery. If you
>do it the other way (negative first) and there's a common earth
>between vehicles (ie if they're touching one another) you'll short
>both batteries if you happen to contact metal with the negative jumper
>clamp while the positives are still connected.

The last bit doesn't make sense either (I've been busy confusing
myself all day long).... It's always the positive lead you want to
keep from contacting metal

The reason I've done it that way for as long as I can remember has
probably got more to do with clamping the positive back onto the cable
so it's not the one that's dangling free while the donor battery is
still connected to both.

I also always assume the possibility that the vehicles may be
touching... as can easily be the case with off road vehicles, and
especially 4WD's with bull bars and side rails.

--
John H
From: Milton on 7 Jul 2010 05:54

<OzOne(a)Crackerbox-Palace.com> wrote in message
news:2f4836ld4e8g85hjr45j3cc5ao9i7l4n7q(a)4ax.com...
> On Wed, 7 Jul 2010 15:29:40 +1000, "Milton" <millame23(a)yahoo.com>
> wrote:
>
>>
>>"Diesel Damo" <Diesel_4WD(a)yahoo.com.au> wrote in message
>>news:bc95f6a7-9883-411a-a8fa-1aece85284e4(a)i16g2000prn.googlegroups.com...
>>On Jul 7, 8:59 am, Neil Fisher <n...(a)magnecor.com.au.invalid> wrote:
>>
>>> Connecting the negative side to chassis rather than battery post is so
>>> that there is a reduced risk of igniting any hydrogen the battery may
>>> be pumping out in a high charge/discharge state - a reasonable
>>> precaution, providing you connect and disconnect the negative side
>>> last, of course.
>>
>>Okay so that's you and John both saying neg should be removed last,
>>but Kev and Trev say it should be removed first. AFAIK you all have a
>>history of generally knowing what you're talking about, so um...
>>
>>Correct, I'm just itchin' for Nods to weigh in, but my money would be he'd
>>agree with anything John says. :)
>>
>>Regards
>>
>>Milton
>
> It really doesn't matter if the battery is a sealed type.
> If not, and the neg is connected remote from the battery then disco
> the neg first to eliminate the extremely rare chance of exploding
> gases.
> If the jump is connected to the battery then again it really is of no
> consequence.
>
> Now that should get you an answer from Nod exactly the opposite..;)
>

As sure as night follows day Oz or perhaps it's day follows night? Just
covering my bases for Nods. :)

Regards

Milton

From: Diesel Damo on 7 Jul 2010 07:13
Now that my head has stopped spinning ;) thanks to all who
contributed. I am more gooder now because of these learnings.
From: atec77 on 7 Jul 2010 07:27
On 7/07/2010 9:13 PM, Diesel Damo wrote:
> Now that my head has stopped spinning ;) thanks to all who
> contributed. I am more gooder now because of these learnings.
Thats goodera sport

--
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