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How old is the battery??
Can also be battery connections. Alternator or Voltage regulator.
Here's how I approach this issue.
1. Jump car to get running.
2. Check battery voltage with car running. Should be 14-14.5 Volts.
3. If step 2 checks out, see if battery will hold charge. If not, pull battery and get it tested. Replace if necessary.
4. If battery is good, pull alternator and get it tested. Any reputable parts store should be able to determine if your alternator or VR is bad. VR is about $50. Decent Alternator (which will include the VR) will be $100-200.
5. Replace offending part.
6. Drive car and have a Merry Christmas!
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