Jump starting from booster
Jump starting from booster
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Discussion

cityneil

Original Poster:

165 posts

260 months

Wednesday 7th March 2007
quotequote all
Right, got me a booster to kick start the boxster. I thought plug and go but reading the owners manual it looks like I have to connect and disconnect leads in a certain order otherwise world collapses. Is this just porsche getting too precious or is there any real danger of blowing circuits?

Wish I could get to Ace Cafe on Saturday but already booked on something else. Will try for next one though!

thegoose

8,077 posts

240 months

Wednesday 7th March 2007
quotequote all
I take no responsibility for this, you understand (i.e. you're responsible for your own car/actions), but I have often started 996s and Boxsters with power packs.

The order you connect the leads shouldn't matter at all BUT there is usually a recommendation that is there to prevent you from shorting the leads out etc. On this basis, I would say connect the red positive lead last and disconnect it first. The reason is that if you disconnect the black negativie lead first and this then makes contact with the car's metal bodywork it completes the circuit and in doing so will probably spark and either burn or mark whateve bit of metal it's come into contact with.

In summary, use it carefully and it'll be fine - some power packs even have switches on which prevent/reduce any risk.

phelix

4,683 posts

279 months

Wednesday 7th March 2007
quotequote all
thegoose said:
On this basis, I would say connect the red positive lead last and disconnect it first. The reason is that if you disconnect the black negativie lead first and this then makes contact with the car's metal bodywork it completes the circuit and in doing so will probably spark and either burn or mark whateve bit of metal it's come into contact with.


I'd have said the exact opposite: negative connected last and disconnected first. A dangling negative lead can only cause a spark when touching a positive terminal whereas a dangling positive lead can cause a spark on any exposed point of the car's metalwork once the earth has been connected.

And make sure that the power pack can't fall over from the vibrations of the starting car and pull one of the leads off.

S99

43 posts

236 months

Wednesday 7th March 2007
quotequote all
Positive on first, then negative.
Negative off first, then positive.
Never had any problems with this method

cityneil

Original Poster:

165 posts

260 months

Wednesday 7th March 2007
quotequote all
Thanks one and all. I think I am clearer! If you hear a bang and cursing in west london think of me!

melv

4,708 posts

295 months

Wednesday 7th March 2007
quotequote all
S99 said:
Positive on first, then negative.
Negative off first, then positive.
Never had any problems with this method


That's what it says on my Clarke booster pack (best fifty quid I've ever spent!!)

Jumps my 964 no probs....