I was helping G Man out with this... he has a 1990 G60 Corrado. There is current draw at all times from the battery... enough to light up the test light. Took out the fuses one by one to eliminate circuits, still drawing current. Alternator wire was also removed. Still drawing current somewhere. There is no alarm so that eliminates that. What else could it be?
Try disconnecting the starter then unplugging the ignition switch, then unplug the the wires at the fuse box, if that makes no difference I guess it has to be a wire shorting somewhere and you'll have to trace the wires from the battery up to the fuse or unfused parts, you sure you removed all the fuses even ones not in the fuse box row?
Since this looks like no simple fix, I think you need an ammeter to help troubleshoot this.
Connect the ohmeter in place of the test light.
IF all of the fuses are removed and you still draw current
then remove the fuse block, and one by one remove the wire harness plugs from the back of the block
when the current goes away, that block has the problem
you will need to figure out from there
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