I would be well aware that everyone has already found our beloved Nazi zombie killers stuck inside the door under the area outside of the light house.
If you keep the conversation going with them, one of them will mention that the fuse has blown and that would leave you to finding a new one which is simple to find. It`s location is just up stairs where the sparky batteries are, and once you have inserted the new fuse, Nikolai will flip a switch which activates these four (May be more.) power station like objects, One of them is just right behind you when you are at the door, I will not share all of their locations though, sorry. Richtofen also mentions that you will have to destroy them (I am not sure how to yet, I've tried the so called "death (Life) ray" and failed to destroy them maybe you will need the scavenger (The second special weapon in the Call of the dead map pack) I haven't tried that yet, so maybe someone could give that a try and tell me what happens then, I've also tried upgraded weapons and I failed miserably.
Unfortunately I wasn't the first but still was proud to find this out on my own, I wasn't aware of the golden rod you needed to find for the VH-11 and apparently a bottle of vodka? for Nikolai? Russian bear maybe? I'm not sure. I also forgot to mention the Steering wheel and switches in the power room, I wasn't sure what they do but I flipped them turned the wheel several combinations and nothing, someone figure that out maybe?
But yeah, you'll get better info at the Golden Rod Forum. See ya.