Join Date: Dec 2005
Nominated 2 Times in 20 Posts
TOTW/F/M Award(s): 18
Thanked 1,103 Times in 942 Posts
Hello and welcome to the forum.
It could be the starter motor,but more usually it's the alternator that causes a drain.Disconnect the battery earth lead,and take the feed wire off of the alternator and insulate it(It's a permanent battery feed so don't let it touch earth....).If,when you reconnect the battery,the drain has gone,then it's the alternator.
3.8 amps is quite a big drain on a battery,too big to be a bulb(Boot light staying on) or similar,you have to suspect a major electrical system component.
Out of interest,anything under 0.3 of an amp is acceptable as drain.......
Good luck and let us know how you get on.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo