LM487 10383321 15764135 15231201 LED Flasher Relay - Fixes Hyperflash for Chevy GMC Cadillac Silverado Sierra Tahoe Yukon Escalade Hummer H2 (2003-2007 GMT800 Platform)

LED-Compatible Flasher Relay for GMT800 Vehicles This 10383321 flasher relay is a direct replacement module designed for 2003-2007 General Motors trucks and SUVs. Its primary function is to correct hyperflash when LED turn signal or hazard light bulbs are installed, ensuring your vehicle's signals flash at the standard, compliant rate.  Product Overview The factory flasher relay in your vehicle is designed to work with the specific electrical resistance of halogen bulbs. When lower-resistance LED bulbs are installed, the relay cycles too quickly, causing hyperflash. This replacement module is electronically calibrated to work correctly with LED bulbs, solving this common issue after a lighting upgrade.  Key Features & Specifications  Replaces OEM Part Numbers: 10383321, 15764135, 10383320, 15231201, LM487, EFL-27.  Connector: 10-pin, factory-style plug.  Primary Function: Corrects turn signal and hazard light hyperflash caused by LED bulb installation.  Design: Electronic flasher module (non-thermal).  Detailed Vehicle Compatibility (GMT800 Platform) This part is designed for the following 2003-2007 vehicles:  For Chevrolet: Silverado 1500/1500HD/2500HD/3500, Tahoe, Suburban, Avalanche  For GMC: Sierra 1500/1500HD/2500HD/3500, Yukon, Yukon XL  For Cadillac: Escalade, Escalade ESV, Escalade EXT  For Hummer: H2 (Note: Some late 2006 models were sold as 2007 "Classic" models and are part of the GMT800 platform. This relay is NOT compatible with the newer GMT900 platform vehicles.)  Installation & Usage Notes  Locate the Old Relay: The factory flasher module is typically located under the driver's side dashboard, near the fuse panel or steering column. Consult your vehicle's manual for the exact location.  Direct Swap: With the vehicle off, simply unplug the old 10-pin module and plug this new one into the same connector.  Test: Turn on your hazard lights or turn signals to confirm a normal flash rate.  Important: This relay is intended for use with LED bulbs. It is only compatible with vehicles that use the specified 10-pin flasher module from the GMT800 platform era.  Package Includes 1 x LED Flasher Relay Module

• Precise GMT800 Platform Fit: Specifically engineered for 2003-2007 GM vehicles built on the GMT800/820/830/805/806 platform. This includes Silverado, Sierra, Tahoe, Suburban, Yukon, Escalade, Avalanche, and Hummer H2 models.
• Direct OEM Replacement: Replaces multiple original equipment part numbers, including 10383321, 15764135, 10383320, 15231201, LM487, and EFL-27. Always verify the part number on your original unit.
• Corrects LED Hyperflash: This electronic flasher relay is designed to resolve the rapid flashing (hyperflash) of turn signals and hazard lights that occurs after upgrading from standard halogen bulbs to LED bulbs, restoring the normal, legal flash rate.
• Simple Plug-and-Play Installation: Features the correct factory-style 10-pin connector. Installation typically involves locating the old flasher module (often under the dashboard) and swapping it directly without cutting or splicing any wires.
• LED Bulb Compatible Design: Engineered for use with aftermarket LED lighting. Its electronic design properly interacts with the lower current draw of LED bulbs, which is what causes hyperflash with standard thermal flasher relays.