not sure if it's new, but when I tried these 3 in "ready for takeoff" States,SA(ELEC) would not turn on:
1.turn STANDBY POWER to OFF, thus trigger STANDBY PWR OFF light.
2. turn GEN1(or2) off, thus trigger BUS OFF light
3.DISCONNECT CDS, thus, turn both LOW OIL PRESSURE and BUS OFF light.

Only when I shut down engine without APU nor GPU in, and TRANSFER BUS OFF light on, I can see the SA(ELEC) light up.