> /etc/group
> ---snip---
> wheel:*:0:root,admin
> ---snip---
>
> when i type in "su" as admin i get an error in authlog
> ---snip---
> Nov 9 13:37:39 sample su: BAD SU admin to root
> ---snip---
>
> The password is 100% correct!
I think you're missing something here.
after making /etc/group have those entries in it, did you
log out of "admin" and log back in?
i.e. show us the shell output of something like this, as user admin:
$ groups
beck wheel
$ su
Password:
#
The "groups" command tells you what groups the session knows
you belong to, not the contents of the /etc/group file, which says
what will happen the next session you start.
-Bob