Charge light going out but not charging battery.

batteries have no guarantee from the dealer
indicates a failed cell
have a load test done and if bad get a new battery

REPLACE ALTERNATOR. NOT CHARGING.

by new battery you mean brand new off the shelf in which case the voltage would have been 12.5volts and not 11.5 volts. battery voltage will drop while cranking an engine but should recover to 12 volts when stopped. The alternators charge directly to the battery by the red wire from the back of the alternator to the positive terminal of the battery. The other smaller wires are for the regulator control and charge lights. Take the vehicle to an accredited auto electrician to have the fault rectified.

you mentioned new alternator and battery, but it seem that the alternator is not charging, when you install the new battery the car started and run and after hours of running specially if head light is on the car shuts down. this is an indication that the alternator is not charging. (factory defect) have it checked or return part to auto supply.
if alternator is good and you have the car jumped and run it will not shut down even if your battery is dead because the charge of the alternator is enough to power the electrical system of the car until you turn it off. this applies to all cars

check fuse box under hood for alt. fuse

The alternator is what charges the battery, most likely there is a bad connection at or to the battery, or the alternator has quit working and you will need to replace the alternator.

a battery waring ligth is not telling you that the battery is defective, it is telling u that the battery is not being charged by the alternator, have the battery and alternator tested to determine th4e cause, a failing battery many times can damage the alternator as it causes it to overheat, so if the alternator is in need of replacing then it is very important that the battery be fully charged and tedsted prior to installing a new alternator if indeed that is the final diagnosis.

When that light comes on, it is indicating charging system problem which could mean alternator not charging for one reason or another like loose belt, faulty alternator, or yes, bad battery or connection at battery, for example. First & easiest thing to do is check all your connections to battery, which you've probably done, and make sure they're tight & clean. Make sure belt driving alternator is good & tight, and in good shape. Now boost the vehicle to get it going & test voltage at battery, after you take cables off. My guess is in your case, the voltage will begin to go down, indicating a bad alternator, that will need to be replaced.

If the charge light is flashing, then staying on, there is something wrong w/ the charging system. Most parts stores offer a free check of your charging system. Have it checked out, there's a good chance u need a new alternator. Let me know what u find. Good luck!

Mazda Mpv 2000 I also have the same problem, the alternater is testing good- 14.12Amp, so what is the problem the battery light will not go off.