I've got a set of fans from what I"m told was an 85 Sentra. Problem I am having is wiring them up. There are 4 wires going to each fan. 2 go in 1 spot, 2 in another. Can someone explain how these are wired up? I've run the black wire & a 12 volt source to every one of them and can't get it to run at all. Thanks for any help.