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nothing unless the mechanics took your car off roading
check your timing belt
A bad starter can cause a Mercury Grand Marquis to not start. A bad alternator or a problem with the security system can be the cause for the car not starting.
The most probable cause is that the voltage regulator has failed. The regulator is an integral part of the alternator so you will probably have to replace it.
Bearing in: Alternator? Water pump? A/C Compressor? Belt tensioner?
the battery could have a dead cell, this could cause it to not charge. Have the battery tested to be sure.
aerodnamics are such that there isn't much airflow past the alternator and high loads cause them to overheat
dead cell in the battery or something is on pulling power from the battery.
One possible cause is a defective alternator, Have the charging system checked.
Hey Cari==Make sure there is good air flow around and through the alternator. Restrictions from heater hoses around alternators can cause them to overheat and fail. GoodluckJoe
Battery Light OnCheck for bad alternator. alt. is goodbattery is goodchecked fues goodwhat about wiring
waddup man my girl has a 95 mercury mystake (mystique) and the same thing happened i replaced two alternators in two days and found out the original one was fine it was a compter in the car (those little electrical harnesses in the engine) and it was corroded so bad it wouldnt keep a charge to the battery and was constantly draining it...