Easy to install but no instruction included. The ground wires were too short, they had to be spliced together and a good foot of 8ga wire added to the negative terminal. This kit is for 2003-2004 models only. Both wires go to the ECU contacts. The white wire you see in the picture goes from the blue side of the control box to pin #42, and the greenish wire goes to the green side of the control box connector to pin #33. Online and other reviews of other similar harnesses tell you that you want to connect to -other. The fan ran at high speed all the time and didn't work when I turned on the AC. You need hptuners to get them working. I used the Silverado 2006 fan settings.
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