A friend has a 2001 2.0L petrol Passat with a problematic battery drain.
With the alternator connection removed from the battery, the doors
closed and locked (and the alarm set) there is a continuous 0.2A (200mA)
drain from the battery.
He has removed all the fuses one by one and the drain remains at all
time. i.e. none of the fuses removed stopped the drain. That either
means that it is not on one of those fused circuits or there is a back
feed through a second fuse.
Putting the fuses aside, my immediate thoughts were the radio (although
he's certain that's through the fusebox), so it should be detected when
the fuse was pulled or the other possible option is the alarm.
Could the alarm be taking more current than usual (dying or dead back up
battery taking a high charge)? But, being an alarm there is no
information on its circuits (or even location) in the manuals available
to the public, so we don't know where to start!
Has anyone else experienced this problem? And can you give him/me some
pointers before we blow a large amount of money at an auto electrician!
Failing that, can anybody recommend an auto electrician in the Swindon area?