SOUND LIKE FAULTY ALTERNATOR.CHECK ALTERNATOR OUT PUT VOLTAGE AT BATTERY.WITH CAR RUNNING OUT PUT VOLTAGE SHOULD BE 13.5 TO 14.5 VOLTS.IF NOT ALTERNATOR BAD.BUT CHECK ALTERNATOR BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES FOR LOOSE DAMAGE.CHECK ALTERNATOR DRIVE BELT AND FUSE.
These are all signs of a bad alternator. The car is running off of only the battery. The alternator charges the battery and keeps the car running. When the alternator quits charging the car will run fine until the battery dies. Then you can jump the battery and charge it, and the car will run fine until all of the electronics and lights run the battery down again.
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