The AC side of the Space Command has a 3-wire connector:
BLK - AC from circuit breaker

BLU - neutral from AC line

GRA - I think this is switched by the Space Command to feed line voltage from the black wire to the power transformer when the remote (or the front panel POWER button) tries to turn the set on.

I can try to tie the black to the gray with some resistive shunt (60W light bulb) and see if it turns on.