If the engine doesn't turn over at all there are a few things that are possible. Start with the battery ground cable and make sure it is making a good ground and is not broken. Also check the positive cable from the battery to make sure you have a good connection and no breaks in the wire. If these are both good you may need to replace the starter motor. There are brushes inside the starter (yes they can be replaced if you know how to take the starter apart) that will grind down to the point of not making enough contact to start your car. Since you said you had the alternator replaced I'm thinking it probably is the starter because any competent mechanic would have checked the battery cables before replacing the alternator.
Have the battery checked out. It may have a dead cell and not holding a charge,
the vehicle needa a new voltage regulater,this should have been checked before battery and alternator as its the cheapest part to replace
Check the battery with a vom meter while the engine is running. It should read about 14.5 volts and if so the alternator is working, than have the battery checked Now if the meter does not read 14.5 volts, have the battery, and the alternator checked. If they both check out okay, the problem is in the battery or the alternator circuit on the vehicle.
It sounds like you have a break in the wire which connects your alternator to your battery, get it checked out.
No, the battery may be defective and the alternator may be just fine or vice versa. Saying that if the alternator was overcharging the battery it may very well have destroyed a good battery. Just have the battery checked at any auto parts store.
One possible cause is a defective alternator, Have the charging system checked.
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. The alternator should have 2 connections.
Is it charging, if not have you checked wiring to alternator.
have the alternator and the battery checked
Simple, have the alternator checked and if it is okay, check the alternator circuit to the battery
Probably loose drivebelt. or alternator belt of it is seperate.
Check your battery post to make sure u have a good connection