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If the battery dash light remains on, it is a strong indication that you have a recharging issue. The new battery will only work if the alternator keeps it charged well. My suggestion would be to take your car to a mechanic and have your alternator tested.
make sure the cables are both good if they have a spot that feels flimsy the wires inside are likely corroded and the current is not running through it properly. a simple charging system check would be recommended.
You either have a bad battery or a bad alternator. Most alternator shops and Advance auto parts store will check both for free. It is possible for an alternator to charge the battery while the car is running but kill it when it is switched off because of a bad diode in the alternator.
The battery light indicates insufficient voltage. I would recheck all the battery connections to be sure they are clean and tight. I would also have the alternator output tested, since the light will come on if the alternator is not providing sufficient voltage to keep the battery charged. Take the vehicle to an autoparts store and they will test the battery condition and alternator output for free. Sorry for your trouble and I hope this helped, Best wishes.
Check the 'Bat' / 'Charge'/ 'Alt' indicator on the dash panel lights when the vehicle ignition is switched on prior to starting the engine.
This indicator should extinguish within approx 1 second of starting engine.
If the indicator is not operating the alternator cannot provide charge current - check:-
1) the wiring connections to the new alternator,
2) the indicator lamp is not blown,
3) the alternator is properly grounded.
If the indicator light works normally, check the output voltage of the alternator is approx 14.5v when the motor is running.
If its about 14.5v, the battery should be charging.
If your battery cables are corroded, I'm talking inside the casing , your battery is running the car and not getting much charge back from the alternator. The least expensive, but time consuming thing to do is replace both battery cables. Try this before any major repairs.
The light you speak of is actually indicating an issue with the charging system and is usually an indicator of a faulty alternator. However if your light flashes and doesn't remain lit it could be a sign of a bad connection in the charging system. If it only flashes once in a while you are better off to wait until it remains lit for a while. Simply because electrical diagnosis is very time consuming and the mechanic can spend hours looking and still not find a clear cause for your issue. And these wasted hours can cost you BIG. But keep in mind that when that light is lit your battery is not receiving a charge and will go dead and could leave you stranded. So don't stray too far from home until you can get this issue resolved hope this helps! and thanks for choosing FIX YA!