wont start all the time just clicks. alt and battery good?
Clicking usually means not enough battery voltage or CCA. You say the battery is good, what did you do to test it? Does it measure 12.4 volts? Not older than 5 years old? Did you check the battery cable connections for loosness or corrosion?
Search Mercury Grand Marquis Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Mercury Grand Marquis Experts