Put the pulley in a bench vise while you loosen the nut. I got the alternator off my 65 amp unit and my new 115 amp unit this way with no problems.

__________________
Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo