E46Fanatics - View Single Post - Lights on while car is off
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Old 01-03-2013, 09:24 PM   #23
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Join Date: Apr 2010
Location: Murrieta, CA
Posts: 9,488
My Ride: '94 325iC & '00 323i
Originally Posted by bmwjatt View Post
I drove around for a while, if the battery was bad the battery light would go on...
That is false. Not a little false, completely false.

The Battery Light tells you nothing about the battery, because it is really a Charging System Failure light. The light means that the charging system is on the fritz, it does not mean that the battery is dead.

The battery can be deader than a doornail, and the light might not be on, and the battery can be brand spanking new and the light will not go off.

That light tells you absolutely nothing about the battery EXCEPT that if the light is on, you can be sure that the battery will be dead in a few miles -- the number of miles depends on how many electrical loads you have running at the time.
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