Google i tried that and could not get it to work the second fan would just click the relay. I have the wiring right i went over it 10 times wire for wire. I have alldata, identifix, even googled the wiring diagram it is correct. I even purchased this harness from blackbear
http://www.blackbearperformance.com/services.asp It does the same thing. Wont work the second pcm signal wire just clicks. I can ground the relay signal wires and the fans work. So it has to be something in the pcm or settings i am missing. If i send you a copy of the tune could you look at and tell me what i done wrong? I have tried changing everything. Only thing i have come up with is it would have to be a camaro os. As the 411 didnt use fans for truck programing. If you have fb you can see the truck at seelys automotive.