I have a OEM E-fan harness and relay block from a 2006 Sierra. The 06 fan plugs were removed and LS1 style fan pigtails were soldered on in their place. This is not the entire core support harness, only the wiring for the fans. Both ECM pins are intact, they were carefully removed from the ECM on the Sierra.
$85 shipped in the 48 states or $75 picked up in Shreveport.
This harness is identical to the one I installed on my own truck (except it has LS1 fan plugs).
Here is the link to my install thread. And the thread also explains how to add a relay to make this harness work on 99-02 trucks.
Installing 06 Chevy E-fans on a 01 Chevy - PerformanceTrucks.net Forums
$85 shipped in the 48 states or $75 picked up in Shreveport.
This harness is identical to the one I installed on my own truck (except it has LS1 fan plugs).
Here is the link to my install thread. And the thread also explains how to add a relay to make this harness work on 99-02 trucks.
Installing 06 Chevy E-fans on a 01 Chevy - PerformanceTrucks.net Forums