 | Home > Technical > Jump leads |
 
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3652   
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in June Land Rover Monthly there is a 5 page artical on jump leads and fitting a permanent supply socket pages 81 onwards, I have seen a Railway locomotive with a battery explosion not a pretty sight DEFENDER 90 TDCI XS,
I hope everyone is well and your land rovers make you happy |
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8th May 2011 7:05am |
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| farmer giles Member Since: 09 Feb 2011 Location: worcestershire Posts: 1299 
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as someone who REALLY doesn't understand electrics
 can someone recommend where a good earthing point would be to connect the -ve claw on the dead vehicle please? |
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12th May 2011 12:22pm |
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| WarPig Member Since: 04 Dec 2009 Location: Sheffield Posts: 1748  
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Holy thread resurrection 
But I would like to know this also. |
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4th Jul 2013 10:42am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17598 
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Any bare metal component away from the dead battery and clear of moving parts will do. If the dead vehicle has a (properly-wired and earthed) winch, there is usually a good earth point somewhere on it. Alternatively, if it is accessible, wherever the earthed battery lead on the dead vehicle connects to the chassis, or an engine earth strap.
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4th Jul 2013 11:34am |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5884 
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Why would you not put the negative jump lead to the dead battery ? 1999 Defender TD5 110
Regards John M0VAZ Econet Station 48 no clock |
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4th Jul 2013 12:19pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17598
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Because following "accepted practice" and earlier posts it is the last connection to be made and therefore there is the risk (indeed probability) of sparking. If for any reason either battery is producing hydrogen gas (as a conventional lead-acid battery will when being charged) there is a significant risk of an explosion.
To avoid this risk, make the last connection well away from either battery and anything flammable. It really isn't nice when a battery blows up. As noted earlier in the thread I have seen it happen, and it is truly a sobering experience. It isn't just the blast, which is big, it is the rain of sulphuric acid which follows it which can be equally injurious. |
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4th Jul 2013 12:51pm |
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| WarPig Member Since: 04 Dec 2009 Location: Sheffield Posts: 1748
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Great word  |
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4th Jul 2013 1:26pm |
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| mobilecentre Member Since: 05 Mar 2012 Location: Evesham Posts: 645
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The Defender struggles for a "good" earthing point, most modern
 cars have a specific point designated for the earth connection for jump starting and to a degree battery charging.
In the absence of this point a good solid piece of metal that the jaws of the crocodile clip will hold on such as a bracket or lifting eye has to suffice. Or you have to install some points  Click image to enlarge |
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6th Jul 2013 9:22am |
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| adafish Member Since: 30 Mar 2009 Location: atherstone Posts: 1385
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Tim, can these be used on 24V, was think of the wife's Horse Hotel, for when the dozy mare forgets to turn off the isolator and gets a flat battery. I hate jump starting with leads on it...? Putting Dreams on Drives at JLR Solihull..
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8th Jul 2013 3:49pm |
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| mobilecentre Member Since: 05 Mar 2012 Location: Evesham Posts: 645
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Yes they will work on 24V no problem
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13th Jul 2013 4:52pm |
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| LinDens90XS Member Since: 24 Feb 2012 Location: Merseyside Posts: 83 
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Just out of curiosity, I have fitted an Anderson connector to my seat box and also to my jump lead so no problem starting someone else, but am I safe using this set up if I should be the one with the flat battery?
Regards Dennis Regards Dennis. |
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18th Jul 2013 10:09pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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Yes. Electricity works both ways
Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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19th Jul 2013 5:42am |
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| JR Member Since: 07 Dec 2012 Location: Auchtermuchty Posts: 532  
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I studied as an Agricultural Engineering Technician in the late 70's and dead batteries on tractors were common. We were taught NEVER to connect the negative first (on negative earth vehicles) as you could easily create a circuit if you then brushed the positive to another part of the vehicle or cause a spark when you attached the jump lead to the positive battery pole.
You should connect the positive first as it'll connect without a spark then connect the negative. With a completely dead battery, connecting the negative direct to the starter casing can often reduce power loss from the jump lead circuit and help start the vehicle. it'll work easier on vehicles where the battery is in the engine bay but it's difficult with a Defender though due to the battery location. |
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19th Jul 2013 7:07am |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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That's not relevant if connecting via an Anderson, though. With the croc clip ends connected to the 'live' vehicle, plugging in an Anderson is about as safe as it possibly can be. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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19th Jul 2013 7:10am |
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