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#1
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About jumping car - Connection Negative
About jumping car -
When attaching NEGATIVE to the target car - what is the difference btwn attaching to battery negative pole and attaching to the metal part of the car ? Why "attaching to the metal part of the car" is the "default instruction" than otherwise ? Thanks |
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#2
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About jumping car - Connection Negative
On Sat, 3 Feb 2007 12:13:45 -0500, "klabu" <klabu_at_gmail_dot_com>
wrote: >About jumping car - >When attaching NEGATIVE to the target car - what is the difference btwn >attaching to battery negative pole and attaching to the metal part of the >car ? > >Why "attaching to the metal part of the car" is the "default instruction" >than otherwise ? You can get a spark when the last of the four connections is made. Its best if the spark is not close to the battery for safety reasons. Don www.donsautomotive.com >Thanks > |
#3
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About jumping car - Connection Negative
On Sat, 3 Feb 2007 12:13:45 -0500, "klabu" <klabu_at_gmail_dot_com>
wrote: >About jumping car - >When attaching NEGATIVE to the target car - what is the difference btwn >attaching to battery negative pole and attaching to the metal part of the >car ? > >Why "attaching to the metal part of the car" is the "default instruction" >than otherwise ? > >Thanks > A battery can emit flammable gas. That last connection generally gives you a spark when you make it so they recommend that you use some other piece of metal to keep that spark away from any potential gas. I once saw a battery explode from jump starting. Sent the person hooking up the cables to the hospital. Possibly he hooked the cables up backwards but ever since I have been a bit more careful jump starting cars. Steve B. |
#4
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About jumping car - Connection Negative
klabu <klabu_at_gmail_dot_com> wrote:
>About jumping car - >When attaching NEGATIVE to the target car - what is the difference btwn >attaching to battery negative pole and attaching to the metal part of the >car ? When you attach the LAST connection, there will be a spark as the circuit is made. You want that spark to be as far away from the battery as possible. Batteries can produce explosive gas. You don't want a spark right near a source of explosive gas. >Why "attaching to the metal part of the car" is the "default instruction" >than otherwise ? Because, to paraphrase Repo Man, "sometimes batteries just explode." --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#5
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About jumping car - Connection Negative
"klabu" <klabu_at_gmail_dot_com> wrote in
: > About jumping car - > When attaching NEGATIVE to the target car - what is the difference btwn > attaching to battery negative pole and attaching to the metal part of the > car ? > > Why "attaching to the metal part of the car" is the "default instruction" > than otherwise ? > Automotive lead-acid batteries DO (not "can") produce and emit hydrogen gas as a normal part of their operation. Sparks ignite hydrogen, a *highly* flammable gas. As others have pointed out, the last connection you make with your jumper cables usually makes a bit of a spark, so you want that spark to happen as far away from the hydrogen as possible. Ever heard of the Hindenburg? -- Tegger |
#6
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About jumping car - Connection Negative
On Feb 3, 6:16 pm, Tegger > wrote:
> Ever heard of the Hindenburg? Aww, come on. Only 36% of those aboard the Hindy died. Ford engineers would do backflips with safety numbers like that. OT? Yes. Flame magnet? Oh yeah. Toyota MDT in MO |
#7
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About jumping car - Connection Negative
On Sat, 3 Feb 2007 12:13:45 -0500, "klabu" <klabu_at_gmail_dot_com>
wrote: >About jumping car - >When attaching NEGATIVE to the target car - what is the difference btwn >attaching to battery negative pole and attaching to the metal part of the >car ? > >Why "attaching to the metal part of the car" is the "default instruction" >than otherwise ? > >Thanks > Usually when jumping a car you are outside with the wind blowing. If so hook the negative to the battery. No gas will ever get the opportunity to collect under these conditions. |
#8
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About jumping car - Connection Negative
Comboverfish > wrote:
>On Feb 3, 6:16 pm, Tegger > wrote: > >> Ever heard of the Hindenburg? > >Aww, come on. Only 36% of those aboard the Hindy died. Ford >engineers would do backflips with safety numbers like that. >OT? Yes. Flame magnet? Oh yeah. Absolutely false. Since the disaster happened nearly seventy years ago, I would be very surprised if anyone aboard the Hindenburg remains alive. Even the Pinto has better statistics than that. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#9
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About jumping car - Connection Negative
i agree because i jump my brothers car when it was real cold and battery popped..every since then i ground it to anything but neg cable..theres my 2 cents worth on this suject... -- Scrapper ------------------------------------------------------------------------ Scrapper's Profile: http://www.automotiveforums.com/vbul...?userid=438443 View this thread: http://www.automotiveforums.com/vbul...d.php?t=670260 http://www.automotiveforums.com |
#10
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About jumping car - Connection Negative
> wrote in message ... > Usually when jumping a car you are outside with the wind blowing. > If so hook the negative to the battery. No gas will ever get the > opportunity to collect under these conditions. It is a safety risk, but I agree...seldom do you have enough hydrogen accumulated to turn the hazard into an accident. But it CAN happen. We are looking at statistical risk. A proper risk assessment would point toward using the procedure whereby the ground or B- cable is hooked to the frame. I have seen cases where hooking both cable terminals to the battery in tight spots might lead to them getting together. In a perfect world, it shouldnt happen, but the risk can be there. "Risk", as in the Challenger explosion, the Hinderburg, and the Titanic, can sometimes become catastrophic fact. |
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