Speaking of an electric fan working as a generator, it took me and my partners a while to figure out why the Rampage would not shut off immediately upon throwing the master disconnect switch.
We did a lot of head scratching before finally figuring out that if the electric fan was running, it was back-feeding the electrical switch panel, which in turn kept the engine running until the fan slowed down sufficiently.
A little re-wiring, and a relay solved that issue. I offer that just as a little bit of knowledge to put in the memory banks in case it's ever needed.
Steve.