Thats a very perceptive question Ozex considering your not even rated on type! Arent you the smart cookie!
Yes mate you are correct. Electric stab trim isnt available with a loss of AC, so physical manual movement of the stab trim wheel is necessary. As any 737 driver will tell you the elevator is very heavey in manual reversion and stab trim helps augment control in pitch.
Hmmm while on the subject, WWW would you happen to know which bus powers electric stab trim? We know rudder and aileron trims are off AC Xfer Bus 1, but Im not sure of stab trim.
PS Oh and Ozex your "what the faaaaark!" factor was mentioned by me earlier referance the 2 + 1 secs recognition in my "Summary" paragraph.