2007+ GMC DENALI BULB APPLICATION : H11 (Low Beam), 9005 (High Beam) KNOWN ISSUES : 1. HID Bulb Flickering after vehicle is ignited. REASON : Reverse Pin Trigger. SOLUTION : i. Locate the OEM Headlamp plug from Alumina system. Using pliers, gently clip and pull out the wiring/pins from its base. Then, re-insert them in reverse.