Prev: weirdest Avalon of the week
Next: mitsubishi quality higher than toyota
From: F Murtz on 8 Jul 2010 05:13
John_H wrote:
> 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.
>


old english and some others used to have positive earths.


From: Brad on 8 Jul 2010 17:30

"F Murtz" <haggisz(a)hotmail.com> wrote in message
news:4c3596c7$1(a)dnews.tpgi.com.au...
: John_H wrote:
: > 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.
: >
:
:
: old english and some others used to have positive earths.
:
:


Mini wasn't it although a lot of vintage are that way.

--
Brad Leyden
6� 43.5816' S 146� 59.3097' E WGS84
To mail spam is really hot but please reply to thread so all may benefit (or
laugh at my mistakes)
>
>


First  |  Prev  | 
Pages: 1 2 3 4 5
Prev: weirdest Avalon of the week
Next: mitsubishi quality higher than toyota