Replaced the mast on Hirschmann motorized antenna on my 1990 300SEL. Now it doesn't go up when I turn on the radio. If I disconnect the connector in the trunk, I hear the motor working and trying to pull the mast down.
Looks like the motor is only running in the down direction.
Removed the fuse for the radio and the antenna to reset them, no change.

Does it sound like the motor is shot or am I missing something?
Thanks in advance for any help.