you may need to go to your local shop and if they are equiped with one get them to attach there scanner to the vehicle and clear the codes for you.
This can be due to loose or corroded cables and or connections , and did the car start even at least once after the battery and starter was replaced? If it did you probably need a new alternator or if your handy enough you have the choice of rebuilding the alternator. Many stores offer free alternator testing , I my self have a 96 Taurus and i have had many problems over the years and now I'm at the point where my alternator is bad and i will soon be rebuilding it. If it is none of these issues then there is some thing more serious wrong in which case it needs to go to a mechanic who can determine and fix the issue.
you may have a bad battery or a bad voltage regulator
Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alternator belt. If the battery and alt test ok than check the connections to the alternator and battery. The alternator should have 2 connections.
The first place I'd start would be the battery, alternator and starter. Verify that the battery is good and that the alternator is fully charging it, and that the starter isn't drawing too much current.
Could be a bad signal sent by the computer or the alternator is not charging to full capacity. Have someone check the charging amps on the alternator.
Defective alternator, dead cell in battery, or something is on pulling power from the battery.
I'm not sure about all of these, but I have a 98 Taurus and the battery light came on. After a few days, the car died altogether and I had to replace my alternator. I would definitely take the battery indicator seriously and have your alternator checked.
Bad connections somewhere in the car battery, alternator, feed line to ignition switch You must have a error code posted or the electrical is shutting down so the computer cant record an error.
You will destroy the voltage regulator if you unplug the battery while it is running, then you will have to replace the alternator anyways.
In the Power Box next to battery.
Yes, it is in the PDB next to the battery.
Maybe you have a problem in your main wiring harness. No fun.. Could also be an electrical sensor.