Not on an Alfa JTD it isn't... Not recommended to jump start anyway, the power spikes involved aren't regulated and can fry your ECU
.... But if you must try it, it must be a an engine and battery combination of greater amp/hr cranking capacity than your own... or you might as well pee against the wind.....
Example: your car is say 1.8 and 65 amp/hr, their car 2.0 and 75 amp/hr then you'll be fine, make sure that you jump charge for at least ten minutes before attempting starting... Even a healthy battery and alternator on the doner charge vehicle will take at least 4 minutes on tick over to replace the cranking amp charge they used just to start their own engine up!
My 2.4JTD was stored for around 2 months and when I returned to her even the central locking didn't work. I could not "jump" start it with my 1.5 alfasud sprint so I got my local indie to go to it.
They fitted a new battery (it had been new around 18 months ago) under warrenty and didn't even chagre me for the call out
I did a trip to see the in laws over in France which was a round trip of 1100 miles then she went back into storage (driving the sprint for the "summer")
When it was time to change over (around 3 months) again she was flat. I tried to jump start her from the sprint again (tried for 15mins at 3000 rpm) no chance.
It then dawned on me that my jtd probably required 60 + amps to turn the engine over and the sprint ledd than 20
Phoned the wife for her 1.9 jtd - started frist time
Thing is we have just spent new year at a holiday park - 3 nights and the battery is flat once agian
The AA man said the battery was good (but only had 5 volts charge) and started it first go with his booster pack. he checked for any "drain" but found nothing
Has any body else had a problem with leaving thier car for over 2 days?????????
Could it be the "famous" alfa electrics strike agian