Try the cables from your battery and alt. Sometimes these can corrode.
The alternator might not be charging the battery
Voltage Regulator?
Defective alternator, loose alternator drive belt, dead cell in battery, or something is on pulling power from the battery.
A light is on or a relay is stuck pulling power from the battery.
Defective alternator, dead cell in battery, something on pulling power from the battery when the vehicle is idle, corroded battery cable connections, or loose alternator drive belt.
nothing to do with the battery it is probably a loose alternator belt or power steering belt
all alternators require battery power to operate.
Have the battery checked out. It may have a dead cell and not holding a charge,
Either your battery is dead and wont accept a charge or your alternator has stopped charging the battery due to a blown fuse, loose or damaged wiring, loose or broken drive belt or the alternator itself has gone bad.
A battery does not produce power, it just stores power. The alternator produces the DC voltage the battery stores. As the power is taken from the battery it is replenished by the alternator.
Indicates a problem with the electrical charging system. Can be a bad battery, alternator, loose alternator drive belt, corroded battery connections, or ground connections. Normally this would indicate a problem with the alternator but not always. Most auto parts stores will check the system free of charge, if you buy the repair parts from them, which would only be appropriate.
No, your battery supplies power to the starter. However if your alternator is defective then it will not supply power to the battery and the battery will soon be depleted.