Re: 2001 Expedition battery light
Do you know if the battery you bought had a full charge in it? An alternator cannot charge a discharged battery. Try charging the batt with a charger. With a full charge on the battery (at least 12.6 volts), start up the vehicle, turn on all the lights and the blower and rev to 2000 rpms. Then check the voltage at the battery. If it reads less than 13.4 volts, your alternator is bad.
Or, you have a bad ground wire.