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bobbycrispbox
Member Since: 15 May 2006
Location: Where women glow and men plunder
Posts: 2580
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I was just reading the instructions on my jumpleads
Quote:Connect the red (+ve) lead to the +ve terminals of both vehicles batteries. Connect the black -ve terminal lead first to the -ve terminal on the starter vehicles battery, then connect the other end to any suitable metal earthing point on the faulty vehicle
It goes on to say this is to avoids frying the electronics on the dead car. My questions:
1. Why would this help? Isn't any metal earthing point going to be connected directly to the battery's -ve terminal anyway?
2, When my whole engine bay has been nicely painted by the kind folks in Solihull, where am I supposed to find a 'suitable metal earthing point' anyway?
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 31st Aug 2007 3:06 pm |
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craig
Member Since: 08 Aug 2006
Location: Home of LR.
Posts: 2545
  
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| Re: Jump lead instructions |
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bobbycrispbox wrote:
2, When my whole engine bay has been nicely painted by the kind folks in Solihull, where am I supposed to find a 'suitable metal earthing point' anyway?
Seen a recovery point used before..... 
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| 31st Aug 2007 3:12 pm |
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bkehoe
Member Since: 25 Feb 2006
Location: Wexford
Posts: 1481
 
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The reasoning is that the dead battery will be charging from the doner vehicles batter/alternator and may be producing hydrogen. When you disconnect the black lead you may produce a small spark. Now we know what happens when hydrogen and sparks mix from the Hindenburg disaster, so while it wouldn't be as dramatic with a D3, some damage could still be done to you, or worse still, your D3 should the battery explode.
Personally, I just go direct from the battery terminals, and I'm still alive! IE - 05 D3 TDV6 HSE - Zambezi Silver
SA - 07 VW Golf TDI - White - Sold!
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| 31st Aug 2007 3:13 pm |
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bobbycrispbox
Member Since: 15 May 2006
Location: Where women glow and men plunder
Posts: 2580
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Pah. I've seen a hydrogen explosion, all it did was go pop and send the testtube flying across the classroom. 
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| 31st Aug 2007 3:27 pm |
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BLFarrar
Member Since: 02 Aug 2006
Location: Deepest, Dankest, Darkest, Dingiest......Le Halifax, West Yorkshire...with strong links to Ireland
Posts: 6222
 
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yeh....I did it the wrong way once - it blew the top off the battery & covered me in acid
fortunately wearing my safety glasses from work
but agree there arent many places you can ground the clip...
Another method.
I've watched traction batteries (for fork lift trucks usually the Chloride brand) having batteries assembled - they join the separate cell terminal posts with links pieces then melt lead into the actual joint using a direct welding electrode i.e across the live cells of the battery....it would appear dangerous...if you ever have the chance of seing this done its worth watching !
....before they fitters strike the arc they just "blow" the hydrogen away with air from their mouths...
so since seeing this I use the battery posts on both cars & use the same "blow away" method I have never had a problem since. BREXIT - done properly.
Right now ...We need Government - not Politics
Save the Dipstick Flagbearer-keep it simple, less likely to fail campaign-agenda items:Starting Handles, Acetylene Lamps.
Founder: Dipsticks-R-Us Inc
D3 HSE-perfectly formed, passenger friendly...has real DIPSTICK
Jag XK-but sadly no DIPSTICK...HUGE design fault
FL2 has DIPSTICK..."real comfort in rear seats"
VW Golf wondermobile (?)..has real DIPSTICK
Morris Minor..original DIPSTICK technology..and a real KEY.
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| 31st Aug 2007 6:55 pm |
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