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A battery, non running, should register slightly over 12 volts DC, when the engine is running, it should register slightly over 15. If it doesn't, then it is an issue with your alternator. If it does, and after boosting and running the car, you turn it off, come back after a few hours and its dead, then your battery is more than likely pooched.
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
It sounds like its your battery. If you had a bad alternator after jump starting the car would stall when coming to a stop. Check the battery connection and make sure they are clean and not loose. Get to car to a Interstate All Battery and they can check your battery and charging system for free.
If the car doesn't start with a jump you might have a bad alternator. The alternator supplies voltage to the car once the engine is running. If the battery is dead, and the alternator isn't putting out sufficient voltage, the engine cannot run. Then again sometimes a car with an extremely dead or internally shorted battery WON'T start with a jump. Replace the battery and try again.
Sounds like you have a toasted battery or alternator. Have you performed a load test on the battery? Have you tried to charge the battery? First remove the battery and charge it externally from the vehicle. If the battery won't hold a charge, or won't hold a charge of 12 volts, replace it. Once you have the vehicle started, test the operation of the alternator. It should be putting out at least 13 volts back to the battery to keep it charged - if it is putting less than 13 volts or more than 16 volts, replace the alternator.
That would probably be your alternator. The car doesnt take as much power to keep running as the lights. The lights use alot of power and if the battery is doing the alternators job it drains quickly. The battery is only designed to start the car then the alternator should take over and recharge the battery. When the alternator fails the battery will soon fail. Even though you had to jump the battery it was still new so it had a big charge. That is why you were able to drive so far. On an old battery and a jump I've seen people drive a long ways until they turn on their lights. I say 99.99% sure it's your alternator. Here is how you can test it. Get your car jump started again or charge your battery and start your car. While it is running get out and unhook the positive battery cable from the battery. If your car dies, you have found your problem(the alternator). I hope that I could be of some help. Good luck.
Make SURE battery and alternator are good because battery starts the car but car runs on alternator power once its started. If alternator is not putting out the power needed, car will die once the battery power is dead or removed.
Sounds as if the Alternator is not charging, alltough it could be a bad battery. Check the connections on the battery and make sure the cables are tight. Jump the car again, and if it starts check the alternator for output, it should be putting out close to 17 volts if the battery is dead. If the alternator charges then you probably have a battery problem, and need to replace the battery.
Are you sure you have the battery connected right, Red to + Black to -? The connections are tight? Are sure the new batery is good? I've seen that happen before where the battery is new but dead. Try jumping it from another car or put that battery in another car and see if it starts that car. If you have a voltmeter check the battery, it should be about 12.8 volts, then check while trying to start the car the voltage shoudn't drop below 10 volts.
Unfortunately, with a dead battery you can't diagnose where the power drain is, it could be a door switch leaving the interior lights on, or a short circuit somewhere. Before purchasing a new battery, you could put a charge on the existing battery to get the car started. Also check for corrosion around the battery cables and posts. This would prevent you from jump starting your car. Once started, you can check things like the alternator for problems.