Do you have the trunk fooled into believing it's closed as you're measuring your drain? Not sure, but there may be control units that wont go to sleep with the trunk open, not to mention the courtesy light. Also, you will want the hood shut. 120ma I believe is too much. Yes it could have been caused by a bad alternator, but you now have that amount of draw with the alt. removed, correct? Do you have the key out of the switch when you measure? How long is the 120ma present?