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dash and tail lights not working but break and turn signals do.
it sounds like a possible blown fuse
Have a look at the headlight switch and its wiring connector. You may find that the terminals are becoming melted or damaged.
Q&A > Mercury > 2010 Mercury Grand Marquis
Q&A > Mercury > 1998 Mercury Grand Marquis
Q&A > Mercury > 1999 Mercury Grand Marquis
Common Problems > Mercury Grand Marquis