My friends Evo had the same problem and we checked EVERYTHING. Fuses, wires, bulb, ballast, new HID kit even. It ended up being a bad ground. Try a stronger ground and see if it fixes it. Does it flicker sometimes? Or is it completely out? My friends would flicker off at the most inconvenient times like in front of a cop.. but would flicker back on after the cop let's us go lol. Anyways try checking the ground by moving it to a better ground source and make sure there isn't any corrosion on it as well.