There can be 101 problems with your car. Does your battery have a charge? Please be more descriptive if you can.
the common cause why the light is on is that your alternator is not working well,try to have your alternator checked .may be the carbon brush is already worn out.
is your battery in good condition and fully charged? is your starter good?
There is a good chance that your battery has a dead cell. It will act like a good battery of you start it every so often, but if left overnight, it dies.
Might be you alternator. Happened on my 1997 grand marq a couple of weeks ago
bad starter, or wire to starter
take the battery terminals off and clean them and the battery mountings on the battery real good and reinstall.
Among other reasons, a pulley or a belt might be broken/damaged.
If your 1997 Ford Crown Victoria clicks when trying to start, it often indicates an issue with the battery or the starter. The clicking sound usually means the starter motor is not engaging properly, which could be due to a weak battery, corroded battery terminals, or a faulty starter solenoid. First, check the battery charge and connections; if those are good, the starter may need to be tested or replaced.
If the engine will not even crank, then suspect a defective battery or starter. Start by removing both battery cables and cleaning the cable connections and battery posts. Reconnect them and see if it starts. If not put a battery charger on the battery and fully charge it. If it will not accept a charge is is defective. It the vehicle starts then you may have a defective alternator. If the battery is good and it still will not start, suspect a bad starter. You will have to remove it and have it tested.
start by checking the switch on the clutch. if the switch is bad, the car won't start. this may not be the problem, but it is a good place to begin your diagnoses.
my battery is good but having problems with starting