{"product_id":"gdukop-dual-speed-wiring-harness-kit-for-chevy-gmc-v8s-674-00923-with-relay-weatherproof-connectors","title":"GDUKOP Dual-Speed Wiring Harness Kit for Chevy\/GMC V8s — 674-00923 with Relay \u0026 Weatherproof Connectors","description":"\u003cp\u003e\u003cstrong\u003eThe GDUKOP 674-00923 wiring harness kit is a complete dual-speed electric fan control solution with relays and weatherproof connectors made to OE-fit standards for Chevy, GMC and Cadillac V8 cooling systems.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis harness assembly is built to replace or upgrade the factory fan wiring for vehicles that use 34-inch radiators and dual electric fans. It combines relays, fuses, sockets and automotive-grade wiring into a self-contained loom engineered to support both low- and high-speed fan operation. The kit is intended to simplify installation while improving reliability in high-heat engine bays and when retrofitting aftermarket fans.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this harness manage low and high fan speeds?\u003c\/h3\u003e\n\u003cp\u003eThe kit uses separate relay paths and a dedicated wiring layout to switch fans between low and high speeds according to the vehicle’s cooling signals. This prevents crossed circuits and delivers reliable power to the fan motors under variable cooling demand.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDual-relay design separates low-speed and high-speed circuits for dependable switching.\u003c\/li\u003e\n  \u003cli\u003ePre-wired connectors match common fan plug types used on Chevy\/GMC\/Cadillac models.\u003c\/li\u003e\n  \u003cli\u003eIncludes inline fuse protection to safeguard fan motors and wiring.\u003c\/li\u003e\n  \u003cli\u003eWiring and terminals pre-tested to OE-style electrical tolerances.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this fit my truck or SUV?\u003c\/h3\u003e\n\u003cp\u003eThe harness is engineered for a specific group of GM models and radiator sizes; it’s tailored for vehicles that originally used dual electric fans with 34-inch radiators. Before purchasing, compare connector types and the vehicle list to ensure compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible models include Chevrolet Silverado 1500\/2500 Classic, Avalanche 1500\/2500, Suburban 1500\/2500.\u003c\/li\u003e\n  \u003cli\u003eAlso fits GMC Sierra 1500\/2500\/3500 Classic, Yukon and Cadillac Escalade EXT\/ESV where dual-fan setups are used.\u003c\/li\u003e\n  \u003cli\u003eCheck the photos (Main Image 7 and 8) for pin layouts and mounting points if unsure.\u003c\/li\u003e\n  \u003cli\u003eDesigned for 34-inch radiator applications—verify radiator width before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable and weatherproof is the kit for engine bay use?\u003c\/h3\u003e\n\u003cp\u003eGDUKOP built the harness from automotive-grade, heat-resistant wiring and weather-sealed connectors to withstand the heat, moisture, and vibration found under the hood. The relay sockets and terminals are prepared for repeated use and long-term exposure to automotive operating conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHeat-resistant insulation protects conductors in high-temperature zones.\u003c\/li\u003e\n  \u003cli\u003eWeatherproof plugs and sealed terminals reduce corrosion risk.\u003c\/li\u003e\n  \u003cli\u003eRelays and fuse holders are mounted to minimize stress from engine vibrations.\u003c\/li\u003e\n  \u003cli\u003eEach wire and terminal is factory-tested for continuity and fitment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat comes in the box and how simple is the installation?\u003c\/h3\u003e\n\u003cp\u003eThe kit ships as a stand-alone wiring assembly with relays, fuses and connectors pre-assembled for a straightforward swap or retrofit. Basic hand tools and a wiring diagram are typically all that’s needed; some models may require tying into existing chassis ground or trigger wires.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eComplete wiring loom with two relays, fused power feed, and fan connectors.\u003c\/li\u003e\n  \u003cli\u003ePre-crimped terminals and sealed connector housings for plug-and-play fitment.\u003c\/li\u003e\n  \u003cli\u003eInstructions and reference photos included—see Main Image 7 and 8 for wiring pinouts.\u003c\/li\u003e\n  \u003cli\u003eDesigned for quick replacement of OEM fan harnesses or integration with aftermarket fans.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This GDUKOP 674-00923 kit is aimed at owners and technicians working on late-model GM trucks and SUVs that employ dual electric fans and 34-inch radiators. It suits anyone replacing a failed factory harness, upgrading cooling for towing or heavy loads, or installing aftermarket fans while retaining correct low\/high-speed control. If you need OE-form fitment, robust heat resistance and a complete relay-based wiring solution, this harness provides a ready-made option that reduces fabrication time and improves electrical reliability.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this harness fit 34-inch radiators?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This kit is designed specifically for dual-fan systems using 34-inch radiators; verify your radiator width and connectors before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the kit plug-and-play or does it need splicing?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Mostly plug-and-play for compatible GM models; some installs may require attaching grounds or trigger wires depending on vehicle wiring.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GDUKOP","offers":[{"title":"Default Title","offer_id":55168839057751,"sku":"B0FLJFK8MR","price":67.16,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/gdukop-front-packaging-harness-kit.jpg?v=1790414613","url":"https:\/\/britishgarage.co.uk\/products\/gdukop-dual-speed-wiring-harness-kit-for-chevy-gmc-v8s-674-00923-with-relay-weatherproof-connectors","provider":"British Garage","version":"1.0","type":"link"}