I got stranded on the road when my engine stopped dead,I had the car boosted and it did start,but as soon as I took the boosters off the engine stopped.Yesterday I boosted the car again and the alternator was charging just fine and the car had retuned to a completely normal operation,can anyone explain how it is that the alternator is sometimes charging and sometimes not.
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That could be a bad battery. Try replacing the battery (cheaper than a new alternator). Usually, if it is the alternator, your battery will be drained and you aren't able to start the car without boosting. The dimming lights is the clue - lights run purely off the battery, not the alternator, as do most of the electric components.
The first thing to do would be to put the battery on a slow or trickle charge for about 24 hours. It may be worn down enough from sitting that it needs to be revitalized. This should do it if the battery is still good. While it is charging, clean up all your cable ends and terminals to bare shiny metal. Do the battery, starter and alternator and the grounds in the engine compartment. Once the battery is charged up try it again. If the car will only start once or try to start once and need to be boosted, you will need a new battery. If it starts and runs repeatedly, then get the output checked on the alternator. A new one should charge at 14-14.5 volts but as long as it shows better than 12 volts it should be okay. Also when you are testing it, turn all your accesories on, radio, heater, A/C operate power accessories and watch to see how the alternator handles the load. The needle on your meter will bounce a little but should come back to where it was. If it doesn't then you will need to replace it as well. Hope this helps.
If battery light is on while engine is running, then the charging system is bad. That is, you will need a new alternator. If the battery is a couple years old, you may have now stressed it a lot also. Expect it to show signs of failure too, quite soon if not already. First thing is to change out the alternator. Put the battery on charge for a while too. Then after new alternator, see if you have weak starting problems over next week or so.
usually caused by failing alternator. If you have a voltmeter you can check it yourself by starting the engine and measuring voltage at the battery. Should be at least 14 volts. If you don't have a voltmeter, take the alternator out and have it tested at the parts store. Let me know if you have more questions.
If your battery is dead and have less then 10 volts, your engine will not run and your ignition keys will not release until you get the battery boosted to have more then 10 volts. Your alternator may have gone bad and is no longer charging 13 to 14.5 volts or there is a loose connection. A bad Battery will also cause this ti happen when it can no longer hold a charge and your going to have to repalce the battery, A battery has a life of around 4 to 5 years and a bad battery will cause a good alternator go go bad also.
Good luck and have your Alternator and battery tested at Auto Zone, they test free of charge and most likely it's time for a new battery if your battery is older then 5years.
Thank you for using Fixya and Auto Zone also Scan for DTC coders free of charge.
Hello. This means for some reason your alternator is not functioning properly. The engine will start and run until your battery goes dead. If you have a voltmeter display on your dashboard the needle will be below 12 to confirm that the alternator is not functioning properly. You need to have this checked out before your battery goes dead so you don't end up stranded on the road. I hope this helps, good luck.
your alternator is likely on its way out. you should take your car to a trusted mechanics shop and have the charging system tested.Its only a matter of time until the alternator stops charging and you'll be stranded on the side of the road Hope this helps..........Good Luck!