Improved Safety and Visibility: With the "All The Front Lamps On" mod, activate high beams, low beams, fog lights, and DRLs all at once! Perfect for illuminating dark country roads at night. Stay safe on the road, even in the toughest conditions! Our lights are designed to shine bright in heavy fog and rain, ensuring you can drive with confidence. TIP: Remember, your low beams and fog lamps work perfectly when your high beams are off! Drive smart, drive safe Compatible Models: Perfectly fits 2003-2007 Chevrolet Silverado and GMC Sierra 1500/2500/3500, GMT 800 series trucks, 2004-2006 Yukon, Tahoe, 2003-2006 Avalanche 1500, as well as 2004-2006 Cadillac Escalade and Escalade EXT. Compatible with Chevy Silverado (2003-2007); GMC Sierra 1500, 2500, 3500 (2003-2007); Cadillac Escalade (2004-2006); Escalade ext (2003-2006); GMT 800 Trucks (2003-2007); Yukon (2004-2006); Tahoe (2004-2006); Avalanche 1500 (2003-2006).Give your beloved vehicle a new lease on life Easy Installation: Simply locate your fuse box and remove the 3 relays labeled Fog Lp, Hdlp-Low, and Hdlp-Hi. Then, lay down the circuit board and pop those relays back into their original spots. No need to modify any existing wiring High-Quality: Crafted from high-quality FR-4 PCB materials, our product boasts a solid construction that ensures durability and enhanced safety for your peace of mind After-sale Service: Since order purchase date, email us or comment in Q&A,if there's any issue before or after purchase, your case will be taken seriously Dimensions -All light on module measures 3 x 3 x 1. Fitment Guide: 2003-2007 Classic 2500-3500 Silverado/Sierra Installation 1. Remove the relays labeled: Fog Lp, Hdlp-Low, Drl, Hdlp-Hi 2. Lay the GM All Lights On circuit board in the location shown (see product images) 3. Reinstall the four relays back into their original location. Compatible with GMC:for 2003-2007 Sierra 1500/2500 HD, 2003-2006 Sierra 3500, 2003-2004 Sierra 2500, 2005-2006 Sierra 1500 HD, 2004-2006 Yukon , 2007 1500 Classic/1500 HD Classic/2500 HD Classic/3500 Classic/3500 HD, 2003 Sierra 1500 HD. Compatible with Chevrolet:for 2003-2006 Avalanche 1500/2500, 2003 Silverado 1500 HD, 2007 Silverado 1500 Classic/ HD Classic, 2007 Silverado 2500 HD Classic, 2007 Silverado 3500 Classic/3500 HD. Compatible with Cadillac:for 2004-2006 Escalade, 2003-2006 Escalade EXT. Compatible with GMT800:for 2003–2007 GMT 800 trucks...