Remove negative first.
alternator is not charging battery, or loose - corroded connection on battery cables
A few causes that will make the Battery Light come on are: 1. Faulty Battery 2. Loose Battery Connection 3. Battery is not Charging, ie. Faulty Alternator
Do any of your lights work ? If not , it sounds like a bad battery cable connection or a dead battery The light all works the battery cable and connection or ok, it is a auto matt,
You might have a bad battery, a poor connection between the battery and alternator, or a bad ground from the battery.
To indicate to you that it may need charging, replacing, or a loose connection.
poor battery cable connection , or dead battery ( I'm assuming that even your underhood light does not light when the hood is opened fully )
because when you connect the both end of the battery to the same battery terminal, it is called a parallel connection, therefore when it's parallel connection the ampere rating of the battery increases, so it's enough that would able to light up the bulb,. .hope my answer would help,. hehehe^_^
The red battery light indicates that the battery is not rceiving sufficient charge. Look for a loose belt or loose/dirty battery cable connection, or have the alternator and/or battery checked.
The reduced engine power light means that there is a problem with the battery or power system. It almost always means a battery connection issue.
Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alt belt.
The "battery" light indicates a problem with your charging system... So either your alternator or regulator, Battery, ground connection or fuse, check the error codes too
its the alternator if the car is running with a battery light on. but check fuses first