If your battery was dead and you jumped it to get it started and the gauge shows your not charging you need to replace the alternator.
Simple, just replace your alternator..
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Possibly defective alternator, or loose or corroded wiring. Drive to an auto parts store and have them check the charging system. Most will do this free of charge.Possibly defective alternator, or loose or corroded wiring. Drive to an auto parts store and have them check the charging system. Most will do this free of charge.
Charge it, replace it,test the alternator,Charge it, replace it,test the alternator,
Any alternator will charge at idle.
alternator is bad
A bad belt, a bad regulator in the alternator or bad brushes in the alternator.
If the regulator is bad, the alternator would have a low charge or a high charge or no charge at all. With a good battery that is fully charged (12.68 volts) and the engine warmed up and idling with no accessories on, you should get a voltage reading at the battery of 14.2 v (plus or minus .2 v).
poor charge or intermitant charge from the alternator, also check condition of the alternator belt
You can have the alternator tested free of charge at just about any major auto parts store. By the way, a bad alternator will not "discharge" a battery - the alternator's function is to provide the charge to the battery. If the alternator is faulty, then it is not providing the charge necessary to keep other components from discharging the battery. I had the alternator tested and it was charging. If the alternator has a bad diode, it will discharge the battery. I replaced the alternator and everything is fine.
Charge the battery.