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If you have these problems,maybe you need to change Relay: 1. When turning the turn signal light to the left or right, the left and right turn lights flash simultaneously. 2. The left (right) turn signal does not flash. 3. When the left (right) turn signal is turned on, the danger light (double flash) also flash. This Flasher Relay Fits: Chevy Models: 2003 Silverado 1500 and 1500 HD 2003 Silverado 2500 3500 and 2500 HD 2003 Avalanche 1500 2500 2003 2006 Suburban 1500 2003 2005 2006 Tahoe GMC models: 2003 GMC Sierra 1500 2500 and 1500 HD 2003 2004 Sierra 2500 HD 2003 2004 2006 Sierra 3500 2003 GMC Yukon,Yukon XL 2500 2003 2004 Yukon XL 1500 Other Models: 2003-2007 Hummer H2 2003 Cadillac Escalade