
While in workshop mode still, press SPACE (Y on XB, Triangle on PS4) while highlighting the generator. How do I power up the radio transmitter in Fallout 4?

You’re done! Note that you need a clear line of sight between the generator and the object that you are powering. When you press space (or the console equivalent) again, the wire will now run between the objects. With the wire in hand, target the object you want to power – in this case, the radio transmitter.
