[rhandwor]

Disconnect the ground wire use a DVOM between the ground wire and the cable set to amps. Get a reading after the under dash lights shut off. Pull one fuse at a time until the drain goes way down. When you find the general area disconnect one item at a time until you locate. I've had an alternator drain the battery disconnect this to check this item. Sometimes a fuel pump relay will go bad and cause this. Normally you will have a small drain for clock and ect.