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Q: Car wont start on 1990 Mercury Grand Marquis

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
car wont start, hear clicking noise. had battery checked, battery good.Jump start, starts right up. Last night while driving car died completely.
(1) Answer
First, fully charge the battery to get a good system voltage baseline. Then have a charging system diagnosis performed. I think you will find that your voltage regulator and/or alternator is underperforming.