1、Applicable Model: Fan upgrade wire harness is replacement for 1999‑2006 ECU Control, please confirm whether your model is applicable before buying. 2、OE Number: The part number of fan upgrade wire harness for reference is 7L5533A226T, please confirm whether it is consistent with the OE you need. 3、Function: You can use this harness to fix the electric fan upgrade directly to the ECU and let the ECU control the fan. Upgrading wiring harnesses is a must to upgrade your truck to an electric fan. 4、Premium Materials: The upgrade wiring harness is made of ABS, which meets and exceeds the OE standard, is resistant to high temperature, and is not easy to bend, ensuring durability. 5、How to Use: Set up the harness to control your dual fan combo, the harness comes with a truck plug, once connected, plugged in and ready to use, without wasting too much time installing.