Alembic electronics aren't compatible with many other makes...they explained it to me once, but that was 10 years ago so I don't remember if it's a voltage issue or what.
If you don't want to wait for Alembic electronics to turn up, you could either try to return the bass as it's not stock (I have no idea if you were told that it was) or call Subway Guitars in Berkely. They seem to have a lot of surplus Alembic parts, but that solution could give rise to other issues.
