Question: LS3 fan control wire; power or ground?

[Gmachine1911]

Originally Posted by randy

http://www.gm-efi.com/news/pcm-ncs-g...ctric-fan-kit/

Works like a charm

Thanks, Randy...I checked that out early on but was intimidated by the prospect of messing with the ECM. Also by the fact that that fuse box is a total PITA to try to open up! I don't own HP Tuners so would I have to send them my ECM? It's also my understanding that I'll need the AC bump harness as well. I like the fact that it's 100% integrated and all relays, fuses, etc. will by in the engine fuse box.
Any insight on getting to the inside of the fuse box as well as the ECM side would be most appreciated!