LS swap cooling fans

[Jfarns03]

Hey guys I did the 5.3l swap on my 68' and I need help hooking up my single radiator Derale fan. It has a black wire and a blue wire. I understand that the black is for the ground, hook to chassis, engine etc.. but what gets me is that with the modified harness Wait4me stripped down, they label two wire looms. #1 cooling fan (hook to relay,outputs negative signal) {green wire}
#2 cooling fan (hook to relay,outputs negative signal) {blue wire}

I spliced into the #1 wire loom and connected both cut ends of the green wire with the blue wire off the fan. By no means am I good with electrical** what have I done wrong and what do i need to do to fix it? Thank you buds