battery voltage goes up and down while car is parked

Asked by Nov 18, 2016 at 06:59 AM about the 2003 Cadillac DeVille Sedan FWD

Question type: Maintenance & Repair

2 Answers

119,655

...Sounds like the alternator may be going bad, bring it to Auto Zone and have them do a load test for you (IT'S FREE)........

5,955

How much? Could be just your AC cycling on and off at idle. A slight movement does not mean there is a problem but a big drop indicates something is probably adding a load to the system or your alternator (with internal voltage regulator) is the issue. Like "joemom" said, have it checked first.

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