I have 3 1548P switches. The top one is the master and is configured with and IP address. The next two are new (reboot after config delete startup-config). I have link cables connected 1:1-2:2, 2:1-3:2, 3:1-1:2. Using the RS-232 console on all three switches config show switch stack-ports show 1 and 2 Link Up, Admin status Disabled.
The switches are routing VLAN 1 traffic, but all three think they are stack master. Only switch 1 has an IP configured, so whatever switch the Ethernet is attached to, ssh connects to switch 1.
The manual says it will automatically join the stack if it has good link cabling, no Ethernet cabling and no saved config. This does not work.