So here's an easy in-game fix for anyone stuck in the Minutemen, Old Guns Quest. This is for you, if you are stuck where the radio transmitter will not activate due to a game glitch.
This is a very easy fix (although I spent tons of time experimenting before coming up with this), and it worked without a patch on my Xbox. After trying multiple power connection options, I finally disconnected everything to the radio transmitter and did the following:
1. Power > Generators - Create 3 Medium Generators (or enough for 11 power units).
2. Power > Miscellaneous - Create a "Terminal (9)". You will need the Hacker, Rank 1 Perk to do this.
3. Connect the wires from the generators directly to the Terminal first. Then, connect a wire from the Terminal to the radio transmitter.
Done! The radio transmitter will power up and you can continue the Old Guns Quest from there!
Hope this was helpful.
-PoopiePants