[-T-]

depending on your year of computer, 99-04(i think) didn't have electric fans from the factory but the computer had the capability to supply the ground but you had to have them programmed to do so. So it you have and 04 and down, is yours programmed to turn them on? Like posted above too, the computer supplies ground to the relay. And also make sure you have the correct pin from the computer, I just did mine in an 03 and was off one pin and the fan ran as soon as I hooked it all up. Moved one pin over to the correct location and everything worked as planned. Lt1swap is a great source for info, thats where all of mine comes from. Good luck