Jump starting - which manual is correct?

[HIFI]

Need to jumpstart the Boxster (don't ask!), but the manual for the Porsche and my donor vehicle do not agree with each other??

I am inclined to trust the Porsche manual, but just want to make sure.

The Porsche manual says the Good battery should not be hooked up at all to the negative lead and the Bad battery's negative lead should be hooked up to the ground.

The Chevy manual is basically the opposite (Bad battery no negative hookup, Good battery negative to ground).

Which is correct?!?

Also, I know I am not supposed to start the Donor car while connected, but how long do I let the two stay connected, before I try to start the Boxster?

One final thing, is it going to hurt the battery further if I wait until tomorrow or should I jump it ASAP and drive it for a while to re-charge?

Thanks!

[CJ_Boxster]

On any car that i jumped, its been negative to negative, positive to positive... Then Start donor car, wait acouple minutes for alternator on donor car to charge dead cars battery then try to start dead car.

When dead car starts, Disconnect jumper cables and allow dead car battery to charge with dead cars alternator before turn off ignition (usually 10-20 minutes).

[BobMarley1]

I thought it was from the dead battery, positive, then positive to the good battery, then negative GROUND(engine block etc...) on the dead battery, then finally on positive on the good battery. I've done this, and there is no spark, unlike when doing the positive/positive/negative/negative thing.

[MNBoxster]

Hi,

You should connect Positive from problem car to Positive terminal of the Donor Car, then Negative from Problem Car to Negative Terminal of Donor Car. But, you should not have the Donor Car running, you want to jump straight from the Battery...

Happy Motoring!... Jim'99

[Brucelee]

Originally Posted by MNBoxster

Hi,

You should connect Positive from problem car to Positive terminal of the Donor Car, then Negative from Problem Car to Negative Terminal of Donor Car. But, you should not have the Donor Car running, you want to jump straight from the Battery...

Happy Motoring!... Jim'99

what Jim said.

[HIFI]

Thanks for the input, can someone look at their Porsche manual and see what I'm talking about? Nothing is hooked up to the negative lead on the good battery and the bad battery's negative goes to a grounding point. Is there just more than one way to jump the car correctly, or is Porsche wrong?

Also, how long do I leave the 2 not-running cars connected before I try and start the dead Porsche?

[[z0ne]]

Originally Posted by CJ_Boxster

On any car that i jumped, its been negative to negative, positive to positive... Then Start donor car, wait acouple minutes for alternator on donor car to charge dead cars battery then try to start dead car.

When dead car starts, Disconnect jumper cables and allow dead car battery to charge with dead cars alternator before turn off ignition (usually 10-20 minutes).

CJ's got it, HIFI. Go with your instinct. Have you ever connected - to +? It just doesn't make sense.

[HIFI]

Originally Posted by [z0ne]

CJ's got it, HIFI. Go with your instinct. Have you ever connected - to +? It just doesn't make sense.

Thanks for all the recent input, however I started this thread in April, so it's a tad late! Hope this helps people in the future. I still find it odd that car manuals can be so different, but c'est la vie...