One problem related to turn signal has been reported for the 1999 Mercury Grand Marquis. The most recently reported issues are listed below.
My headlights, hazards, and turn signals all just randomly went out while driving. They have not come back on since. After reading forums I believe it to be the lcm but my year model is not included in the recall. I believe this issue dates back farther than 2000 and Ford should step up and recall more of these lcm components.