one fan is run by temp sensor. the other goes when ac is on. i have never once used my ac so i wired both to go on at same time(im sure you will want this). if you leave the stiped wires unhooked the car will never know if it needs to turn the fans on, can you say big problem?! this method get both fans working with stock sensor and has high and low.
when i said molex/connector i mean the stock wireing harness with temp sensor. j sin