Gledewen Electric Fan Wiring Harness for 1999–2007 Chevy/GMC/Cadillac — Dual-Speed Relay, 34-inch Radiator Fit

If your vehicle's electric fan wiring has become brittle, corroded, or has failed after years of service, this dual-speed harness from Gledewen is built to match OEM fitment and restore proper cooling fan operation for gasoline-engine trucks and SUVs with 34-inch radiators. The harness includes relay and circuit breaker mounting provisions and uses durable wiring and terminals so it can be installed as a plug-and-play replacement or integrated into an aftermarket electric-fan conversion.

Which vehicles and engines does this harness fit?

This harness is intended for gasoline (petrol) engines only and was engineered for specific Chevrolet, GMC and Cadillac pickup and SUV models from model years 1999 through 2007 where listed. It is not compatible with diesel engines.

• Chevrolet: Silverado 1500/2500 (1999–2006), Silverado 3500 (2001–2006), 2007 Classic-style Silverado 1500/2500/3500, Avalanche 1500/2500 (2002–2006), Suburban 1500/2500 (2000–2006), Tahoe variations (2000–2006).
• GMC: Sierra 1500/2500 (1999–2006), Sierra 3500 (2001–2006), 2007 Classic-style Sierra, Sierra Denali (2002–2006), Yukon/Yukon XL and other listed Yukon variants (2000–2006).
• Cadillac: Escalade series (2002–2006) including EXT and ESV.
• OEM cross-reference: replaces part numbers 674-00923 and 67400923.

How does the Gledewen harness improve reliability over worn original wiring?

The harness uses high-quality copper conductors and durable plastic insulation rated to resist heat, oil, abrasion and corrosion — common failure modes for under-hood wiring. Relays and a circuit breaker are supported with mounting points to keep components secure and minimize vibration-related wear.

• Heavy-gauge wiring for stable current delivery to dual-speed fans.
• Corrosion-resistant terminals and factory-checked crimps for reliable connections.
• Built-in relay mounting and circuit breaker provision for neat, secure installation.
• Designed for 34-inch radiator fan layouts typical on listed models.

What should I expect during installation and compatibility checks?

The harness is manufactured to meet or exceed OEM specifications so it can be installed in place of the original fan wiring assembly. Basic wiring knowledge is recommended and professional installation is advised when possible to ensure correct relay and breaker placement and secure connections.

• Direct-fit for listed models; confirm vehicle year and engine type (petrol only).
• Inspect fan size (34-inch radiator fan requirement) and OE connector match before installation.
• All wires and terminals factory-checked; relays and breaker not necessarily pre-mounted.
• Replacement part numbers: 674-00923, 67400923 for reference during purchase.

What warranty and post-purchase support does Gledewen offer?

This harness includes a 24-month warranty for replacement or refund through customer support channels. If you encounter fitment or performance issues, contact the seller so they can assist with a replacement or troubleshooting guidance.

• 24-month replacement or refund policy available via seller contact.
• Factory-tested wiring and terminals to reduce initial defects.
• Support recommended for installation questions or fitment verification.

Who is this for: The Gledewen Electric Fan Wiring Harness is aimed at owners and mechanics working on compatible late‑1990s and 2000s Chevrolet, GMC and Cadillac trucks and SUVs with gasoline engines who need a robust, OEM‑style replacement for aging or damaged electric fan wiring. It suits vehicle restorations, cooling system repairs, or upgrades to standalone electric fan setups where a clean, secure relay and breaker mount is desired. If you prefer a plug-and-play replacement and want components built to resist heat and corrosion under the hood, this harness provides a practical, warranty-backed option.