hey guys i bought some oem fans of an silverado the pigtails on the oem harness where cut off but the guy gave me the harness for free soo figured il try and make it work...the problem is i dont know which cable goes to what side of the pigtails or the connections at the fans..can someone take a close up pic of the connection of each of the fans for me where the color of the cables are visible it will be greatly appreciated i know one fan is gray and yellow and the other is blue and black thanks for anyone that helps out

 

Just hook it up. Worse case it'll turn backwards and you'll have to swap the pins. Or hook the fans up to a battery.

 

hes right nothing bad will happen if you connect them wrong just turn the opposite side.... in my opinion its easier and cleaner to find your power and ground and use a 30-40amp 4 post relay and wire them that way to turn on with the key and hide the relay under the fuse box... mine is 06 and had trouble with the fans turning on @certain temp, changed all the fuses and relays and nothing so i just went the easy way and went with a relay now they are always on

if you need any help shoot me a PM i can help you with the wiring