Daveskater
Premium Member
Registered: 29th Apr 08
Location: Oxford, UK Drives: Jap wagon
User status: Offline
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As long as you don't touch the positive clamp thing against the car body and don't hold both clamp things at the same time with no insulators/handles on then you'll be reet.
I think I looked it up in my Haynes book once though, it says you're meant to put the lead on the running car's positive, then the dead one's positive, then the running one's negative, then a lifting eye type attachment to the engine. I did it that way and it worked fine.
You back on our shores now btw mate? 
Numberwang!
Originally posted by AlunJ
I like you Dave, you are a man of men
Originally Whatapp'd by Neo
Dave's maybe capable of a drive-by cuddle
Look at my pictures
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Kano
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Registered: 29th Aug 04
Location: Fife
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DO NOT attach the earth to the earth on the battery.. You can fry ecu's by doing it that way. Attach the earth to an engine mount or that.
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neil h
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Registered: 28th Sep 06
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quote:
Originally posted by Robbo
Also how do i avoid getting a (literal) shock?
Basically don't touch the car body if your in contact with the battery +ve. Simples 
And as Kano said don't connect straight to the battery -ve as you risk drawing quite large currents (and damaging stuff) 'cus of the low earth impedance.
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
User status: Online
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I've always used the battery earths 
Do you mean on both cars?
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Robbo
Member
Registered: 6th Aug 02
Location: London
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Cheers lads, didn't work though... battery must be dead dead dead... altho the radio and rcl still works... no turnover whatsoever 
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Jake
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Registered: 24th Jan 05
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are the blowers weak with the ignition on?
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alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
User status: Offline
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quote:
Originally posted by Ian
I've always used the battery earths
Do you mean on both cars?
I was going to say this as well and that I've had no ill effects, but realised the ABS sensor started playing up in my dad's car when I jumped mine off it. But then I realised the battery's in the back under the seats and it's just terminals in the engine bay iirc, so it's not only if you take it direct from the battery.
The old man was a mechanic, he says it's just in general not good for a car to be used to jump start another. And now refuses to do it if/ when my battery's flat 
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Kano
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Registered: 29th Aug 04
Location: Fife
User status: Offline
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quote:
Originally posted by Ian
I've always used the battery earths
Do you mean on both cars?
Yeh just in general.. I jump start hundreds of cars a month (work for green flag) and I only connect to the earth if I really have to. Dont fancy paying for new ECU's all the time..
Robbo, is it definately the battery? If connecting it isn't making any difference it sounds more like a starter problem. If so give the starter a couple of taps with a hammer and try it.
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Kano
Member
Registered: 29th Aug 04
Location: Fife
User status: Offline
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quote:
Originally posted by alan-g-w
quote:
Originally posted by Ian
I've always used the battery earths
Do you mean on both cars?
I was going to say this as well and that I've had no ill effects, but realised the ABS sensor started playing up in my dad's car when I jumped mine off it. But then I realised the battery's in the back under the seats and it's just terminals in the engine bay iirc, so it's not only if you take it direct from the battery.
The old man was a mechanic, he says it's just in general not good for a car to be used to jump start another. And now refuses to do it if/ when my battery's flat
As long as its done right it does no damage to either car. Its only going to do damage if you dont know what your doing. As for the ecu thing it is only 1 in so many that it will happen with but its not worth the risk.
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John
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Registered: 30th Jun 03
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I've never had a problem using the battery earth, it's no different from any other earth on the car.
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Robbo
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Registered: 6th Aug 02
Location: London
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quote:
Originally posted by jake
are the blowers weak with the ignition on?
nope, all was fine til i left the lights on (for 3 hours!) on sat
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Robbo
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Registered: 6th Aug 02
Location: London
User status: Offline
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quote:
Originally posted by Kano
quote:
Originally posted by Ian
I've always used the battery earths
Do you mean on both cars?
Yeh just in general.. I jump start hundreds of cars a month (work for green flag) and I only connect to the earth if I really have to. Dont fancy paying for new ECU's all the time..
Robbo, is it definately the battery? If connecting it isn't making any difference it sounds more like a starter problem. If so give the starter a couple of taps with a hammer and try it.
cheers man, will give it a try
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sand-eel
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Registered: 15th Mar 07
Location: carluke/braidwood--IRNBRULAND
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see when you connected your car to the other car, did you start the engine on the other car?
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M2RTY
Member
Registered: 25th May 01
User status: Offline
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does it spark when connecting the 2nd lead on your car? if not, then it needs a clean to get elec conducting
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alan-g-w
Member
Registered: 9th Nov 07
Location: Glasgow
User status: Offline
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quote:
Originally posted by Kano
quote:
Originally posted by alan-g-w
quote:
Originally posted by Ian
I've always used the battery earths
Do you mean on both cars?
I was going to say this as well and that I've had no ill effects, but realised the ABS sensor started playing up in my dad's car when I jumped mine off it. But then I realised the battery's in the back under the seats and it's just terminals in the engine bay iirc, so it's not only if you take it direct from the battery.
The old man was a mechanic, he says it's just in general not good for a car to be used to jump start another. And now refuses to do it if/ when my battery's flat
As long as its done right it does no damage to either car. Its only going to do damage if you dont know what your doing. As for the ecu thing it is only 1 in so many that it will happen with but its not worth the risk.
We knew exactly what we were doing, just that he mentioned around the time of him using his car to jump mine it started acting up. Maybe not related, but he seemed to think so.
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sand-eel
Member
Registered: 15th Mar 07
Location: carluke/braidwood--IRNBRULAND
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Electrical components can only take what current they use, they can't use too much current and fry them selves, only if there is an internal short circuit this will happen, which is no way related to jump starting.
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Kano
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Registered: 29th Aug 04
Location: Fife
User status: Offline
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quote:
Originally posted by sand-eel
Electrical components can only take what current they use, they can't use too much current and fry them selves, only if there is an internal short circuit this will happen, which is no way related to jump starting.
So the numerous times I've seen ECU's having to be replaced after jump starting didn't happen?
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micra_pete
Premium Member
Registered: 23rd Apr 03
Location: West Yorkshire
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An old rac man always told me
pos to pos
neg (on the good car) to a big bolt or something on the engine of the car being 'jumped'
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John
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Registered: 30th Jun 03
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Apart from a bit of resistance depending on where you connect the lead to any earth will be the same as any other earth, it's a common voltage plane.
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sand-eel
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Registered: 15th Mar 07
Location: carluke/braidwood--IRNBRULAND
User status: Offline
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quote:
Originally posted by John
Apart from a bit of resistance depending on where you connect the lead to any earth will be the same as any other earth, it's a common voltage plane.
exactly, the only thing that would wreck an ecu is a big voltage spike, which done direct to the battery or anywhere on a car would have the same effect.
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
User status: Online
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The impedance is slightly higher via an earth strap to the engine though so you are effectively protecting against spikes and current drain because the strap can't supply it.
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sand-eel
Member
Registered: 15th Mar 07
Location: carluke/braidwood--IRNBRULAND
User status: Offline
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ecus are usually earthed on a common earth point on the body though.
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