Are your battery cable connections clean and tight ?
Dead battery and/or alternator.
bad battery, and bad alternator not keeping it charged - also bad connections to the battery or loose wire connections on the alternator.
If the car won't start it is usually the battery, starter or could be the altenator. What are the symptoms when you try to start it, is there any power?
If the battery and alternator are both good, Test them to be sure, then you need to take a multimeter and verify that the power from the alternator is actually reaching the battery. It could be a simple wiring problem
ALTINATOR OR STARTER. JUMP START CAR, TAKE POSITIVE CABLE OFF BATTERY,IF CAR DIES IT IS ALTERNATOR. GOOD LUCK
Some new alternators will not charge unless the battery has a full charge already.
No, not unless you installed a 6 volt battery instead of a 12 volt battery.
test the voltage on the battery first, then on the alternator. If its good then it could just be the diode in the alternator. I would suggest you replace it becuase eventually your alternator will die and the battery will not get charged leaving you stranded somewhere. It is possible to just be a battery but you wont know unless you have the battery tested. check the voltage on the battery and the alternator before you do anything else.
Get a new battery, Auto parts stores sell them.
Test battery with a load tester. If battery passes you have a problem with connections or cables.
Unless the battery is shorted or sulfated and will not take or hold a charge, most likely the alternator is bad
Generally, if a car engine will not turn over without a jump start, the battery is not charged. Either the alternator is not charging it, or the battery has failed and will not hold a charge. Since you have replaced the alternator, that leaves the battery. You can have your battery tested at an auto parts store before buying a new one. It is also possible that there is something draining your battery while the engine is off. The clicking noise from the ABS indicates possible electrical system malfunctions that are best diagnosed by a professional mechanic.