While I was experimenting with touching different wires to the red terminal on the battery I fried a $15 fan. I don't know if the weak connection formed by just touching the wires lightly to the terminals causes the temporary spin of the fan, or whether the green or blue wires need some kind of DC voltage for the fan to work. What I got was a momentary spin-up of the fan that then stopped.
While trying to figure this out for myself, I touched the yellow wire to the red terminal on my 12v battery and the black wire to the black. I would use the molex connector, but these fans are going into a telescope that doesn't use those connectors. Answers given on other internet sites to similar questions by other posters were conflicted. It's funny that I'm having such a hard time finding the answer to this question. I liked going through the molex adapter because I could change out the fans if they died/quit working without having to desolder anything or clip and resolder. I wired up some regular 3-pins in a cabinet one time for an HTPC and they had the molex connector adapter. The motherboard reads out the temp and tells the pin to go up in RPM or down in RPM depending on the need for heat dispersion.
I'm not sure what "sense" means in the 4-pin layouts, usually with 3 pin, the "control" is the fan speed. Now that's a good point, although I don't think it's necessary.
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