Jatter

Hi this is my first entry on this VW site, my wife as a Lupo SDI which is a great car But recently its started draining the battery, an auto electrician looked at it and removed the aftermarket alarm and central locking. three days later it was flat again, I charged the battery and disconnected the negative lead from the battery, today I put an Amp meter between the negative lead and the negative connector and it showed 6.2 amp drain for a few second then went to zero. Help as any one got any Ideas PLEASE.....