Q: ALTERNATOR ISSUE?

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I HAD AN ISSUE WITH MY CHECK ENGINE LIGHT TURNING ON. I TOOK IT TO A LOCAL MECHANIC AND HE DID A BUNCH OF CHECKS. WHEN TESTING THE ALTERNATOR HE NOTICED THAT WHEN HE STARTED THE ENGINE THE VOLTAGE JUMPED FROM 12.5V TO 14.5V LIKE NORMAL. THEN ALL OF A SUDDEN THE VOLTAGE DROPPED BACK DOWN TO 12.1V AND NEVER CAME BACK UP WHILE BEING TESTED. IS THIS ISSUE IN FACT A ALTERNATOR ISSUE? I CAN'T SEEM TO FIND ANY INFORMATION ABOUT THIS ISSUE.

My car has 157000 miles.
My car has an automatic transmission.

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