I measured my car's voltages with a multimeter.
1) Battery voltage w/ car ignition off: 12.55v
2) Battery voltage w/ car engine running: 12.45v
3) Battery voltage w/ car engine running and headlights and ac fan ON: 12.05v
4) Car engine running and voltage output directly at the alternator itself: 12.45v
Is this a sign of a bad alternator and must it be replaced? Or should a bad alternator displace an even lower voltage than 12.45v?
Thanks