Seamless Electric Fan Conversion: Designed to convert 1999–2006 GM trucks and SUVs from mechanical to electric cooling fans, enhancing cooling efficiency and performance. Plug-and-Play Installation: Pre-terminated harness with OEM-style connectors ensures a straightforward installation without cutting or splicing wires. High-Quality Components: Features durable wiring, weather-resistant connectors, and robust relays for reliable long-term operation. Compatible with PCM Control: Supports PCM-controlled fan operation; note that PCM programming is required for proper functionality. Wide Vehicle Compatibility: Fits a range of GM models including 4.8L, 5.3L, and 6.0L Engine applications found in Silverado, Sierra, Tahoe, Yukon, and Avalanche from 1999 to 2006. Upgrade your GM truck or SUV's cooling system with the Michigan Motorsports Electric Dual Fan Upgrade Wiring Harness. This harness facilitates the conversion from a mechanical fan to a more efficient electric fan setup, improving cooling performance and engine efficiency. The plug-and-play design features OEM-style connectors and pre-terminated wiring, allowing for a clean and straightforward installation without the need for cutting or splicing. High-quality components, including weather-resistant connectors and robust relays, ensure durability and reliable operation. This harness is compatible with PCM-controlled fan operation; please note that PCM programming is required to enable this functionality. Compatible with a variety of GM models from 1999 to 2006, including Silverado, Sierra, Tahoe, Yukon, and Avalanche, this harness is an ideal solution for those looking to enhance their vehicle's cooling system.