Slow-and-painful-but-effective way of narrowing it down is to wire in an ammeter, then pull fuses one by one until the abnormal drain is squelched; that'll at least tell you what circuit is involved.

__________________
Craig Bethune

'97 SL500, 40th anniversary edition

'04 Olds Bravada (SWMBO's)
'06 Lexus ES330
'89 560SL (sold)


SL--Anything else is just a Mercedes.
(Kudos to whoever said it first)