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Keep your shirt on
Proper procedure IS to disconnect the negative cable FIRST to prevent spark.
The reason you put jumper cable negative on the engine is to prevent the majority of the jump current from going into the battery and absorbing much of it before it reaches the starter.
Also the talk about ground and earth is irrelevant in a car.Ground is ground since the battery is it's own "earth". Sheesh.
Again please explain , standard practise is to apply the leads and let the donor car run for a few minutes (this procedure allows for any current dumps that will likely occur upon connection) and then start the dead car. Then remove the remote from the battery earth lead first so that any sparks (there could well be with a large charge imbalance from the drained battery and the donor full battery) are nowhere near the madly gassing charging battery... Sorry mate but you are wrong... I should make the point that th edonor car should not be running at connection time. Todays alernators can have enourmous current potential..
With and efi motor you are saying it should be shutdown my interupting the ground (breaking the ground connection) and not interupting the power (the positive) to the fuse panel, because that could cause demage to the eletronic. Is that correct??
Sorry mate but YOU are wrong.If you are jumping the battery it is DISCHARGED and not wildly gassing.That occurs when CHARGING a battery and I agree totally in that . It is standard and CORRECT practice to ALWAYS make the ground circuit last to be connected and the FIRST to be disconnected to minimize the potenti to spark on connection.Don't believe me? Do a little experimenting or research BEFORE you argue this further and you will find this is not just me blabbering on about something I know nothing about. Might save a bit of embarrassment for you. ,