I would actually like to know how the alternating flashing works. If it isn't too difficult to do, I would like to rig up a system for my other project car. My assumption was that a five tab relay could be rigged to operate in an alternating pattern.Like stated above - it won't go back to working properly until you fix the ground. The marker light doesn't have a direct ground. It works grounding through the 1157 bulb. No lights on - marker and turn signal blink together. Lights on they will blink alternate. Long story on how that works.