perfect to convert my '04 1500 Avalanche to electric fans when it is hard to find the OEM relay box and harness. The second hand '05 fan assembly was plug and play. PCM programming procedure is widely available on the internet. It is easy to install even with no provided guidance. It has a perfect fit and wire length in my case. An installation notice could be a plus. 12v is taken the red alternator interconnection box and ground on its support on the engine. relays are installed at the rear of the main fuse box. I've just added nuts on both fuses as my fear was if the plastic frame becomes soft the red wires will lose tightness and make a heat point on the connection. The wires are now strongly tightened between 2 nuts and not on plastic frame. Also added varnish lock and thermo sleeves on permanent positive lugs for better protection. I strongly encourage to perform this easy mod on the harness.
