Pop the hood and look to see if you have any naked pulleys. If your belt is broken, you will probably lose more than your alternator. Modern cars have serpentine belts that run everything: Power Steering, water pump, air conditioning, etc.
your water pump and or alternator is frozen ( broken )
Alternator defective, or alternator belt broken or slipping.
The light is on because the alternator is not putting out the required voltage. Either the belt is broken, loose, or the alternator is defective.
Bad alternator or loose or broken belt.
It could be a lose or broken belt. The same belt drives the AC and the alternator.
The most common cause is a loose or broken alternator belt.
check fan belt is not broken or loose and check alternator
alternator drive belt?
Loosen the alternator tensioner bolt. The alternator belt will become loose. Remove the alternator belt. Put the new alternator belt on and reverse the process.
Yes, I know of no engine where the alternator is driven by the cam belt. The alternator is driven by a drive belt or serpentine belt.
Is the belt missing? Maybe the tensioner is broken. your belt must be broken and missing ,that is about the only answer.
Defective alternator or broken alternator belt.