I have an st & my passenger motor went last summer, just last week my drivers one went.
The motor is easy enough to replace but buy it with the regulator attached as fitting an old regulator to the new motor is an utter arse (read wound cable springing all over the shop).


To test to see if power is getting to the motor then press window switch with ignition turned to accessories & interior light on. If the interior light dims when your holding the window switch ( v slightly) then power is getting to the motor but it's dead


Hope this helps


Martin