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Q:

will turn over but not start on 1999 Lincoln Town Car

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
batery goes dead over night,replaced rear suspension air bags and fuelpump.had batery and alternator checked. What could it be.
(1) Answer
You could have a faulty battery. But if you verified the battery holds a load and is fully charged, then you need to check for a parasitic draw, such as one you may have when a relay stays engaged (fuel pump relay, PCM relay, compressor relay for the suspension relay. etc...)

Something may be staying powered at all times, running the computer down.