Idle air control? Fuel pump? Coil?
One possible cause is a defective alternator, Have the charging system checked.
not charging the battery properly... check the alternator.
I have a 2.0 1995 Mercury mystique the battery charge light was on no output on old alternator. Replaced alternator No output from new alternator "charge light out" (wiggle test wires& re-check wires) at alternator *still no output* is there a fuse that could be the problem or just another bad alternator... I would check the alternator plug before getting another alternator, it may be bad. And is a lot cheaper to replace.
go to a auto parts store like advance auto and have them check your computer to see why it is on. they do this for free. this might give you a idea on why its on. if you havent already.
I can tell you that on a 2000 mercury cougar it is a fuse on the positive cable between the battery and the alternator
Get the alternator checked before your battery goes dead.
Needs new alternator.
Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alternator belt. If the battery and alt test ok than check the connections to the alternator and battery. You may also have a battery drain (something that is staying on and killing the battery)
dead cell in the battery or something is on pulling power from the battery.
Normally it means the alternator is failing.
This indicates a no-charge situation. Most likely the alternator is bad.
There is a battery light above the engine temperature gauge