99 S320 112k

Have had parasitic drain for years I could not locate. Installed neg. grnd. switch to deal with it (what a pain of a solution). Finally battery died and replaced with new MBZ white. Now alternator is dead and so I bought a rebuilt.

Now with the alternator out, I put a meter across the negative side of the new battery, and I am getting a drain of only .120 on the milliamp scale. I pulled every fuse in the engine compartment and in the trunk and the .120 never dropped. Seems to me it used to be much higher drain.

Questions:

1) Is it possible that the parasitic drain for all this time was in the old alternator or old battery? Can an alternator drain a battery in the off position?
2) Is there another fuse block I am missing?

3) Is a .120 drain in the realm of normal?

4) The pulley on the rebuilt alternator I bought is shorter requiring that I switch the old for new prior to install. Any help with how I get the pulley nuts off without damaging the new unit? Or where I might take it to have this done?

Thanks for any help,

Chris