Short in the electrical system
A short is possible but normally a short will blow a fuse. IMO, more than likely something is pulling power from the battery. Dome light, glove box light, under hood light, trunk light, brakes lights switch stuck on, or a relay is stuck. If you see no lights on then check for a relay that is sticking.
Check the battery cables or starter.
Test the battery with a digital voltmeter. You should get a reading of 12.6 V if the battery is fully charged. If the battery is fully charged then you know the alternator is functioning properly and your problem is more than likely a defective starter.
Voltage Regulator?
You need to replaced the starter or the alternator.
check your alternator or make sure the starter is on correctly
Starter Ignition Neutral switch
Yes, as long as you have a fully charged battery and good starter the engine will start even if the alternator is defective. The engine will run until the battery looses it's charge, which it will. if the alternator is bad.
could be the alternator or starter sounds like the alternator if the battery is gone flat get the alternator tested at auto parts or garage jump charging the battery might get you out of trouble for a bit
Check the alternator if that don't do it change the battery
is your battery in good condition and fully charged? is your starter good?
Remove the starter and haeit checked at auto parts for amp draw Check the alternator to see if it is keeping the battery charged Check engine ignition timing may be too far advanced
I have a 97 Sonata. I recently had my car NOT turn over at all. I replaced the battery and still nothing. I then jumped on the internet and I read about listening for a "Click" when trying to turn over the engine. I needed a new starter. Once replaced, they changed the alternator belt as well and the car started right up. Maybe a new starter is all you need. (My car also has 170k miles on it and was told it was a very good mile to get a starter replacement. 250.00 bucks for all I believe....