Sounds like you have something that is on all the time and drawing power from the battery. Check, dome, courtesy, trunk, hood, glove box, and brake lights.
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.
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.
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.
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.
You will destroy the voltage regulator if you unplug the battery while it is running, then you will have to replace the alternator anyways.
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.
your alternator was never the problem. Its your battery and/or charging system. the reason the lights get brighter is because the car isn't getting the propper amount of energy from the battery and is having to directly draw off of the alternator. when the engine is rev'ed the alternator spins faster creating more current to charge the battery, witch is why the lights brighten at higher rpms.
Sometimes an alternator with a weak diode(s)can test out fine, but can still trigger the light. I believe the problem is in your alternator. Good luck.
There isn't a fuse for the alternator. The alternator is belt driven, and there'll be two lines coming from the alternator - one goes from the alternator positive to battery positive, and the other goes to ground.
could be alternator or charging circuit or could be anything got to do with the battery when its draining out loose connection terminal