My fans do spin freely. I think my biggest question is why there is no power at any of the sensors. Hopefully the problem lies in a bad relay or blow relay fuse. I would think there would be power even if the relay is bad (which would just keep the fans from turning on - the wires at the sensors are just part of the low-voltage "on/off" part of the circuit). Consequently, I hope it is simply a blown fuse. I'll keep my fingers' crossed and check when I get home from work.