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No, @ 13.6 v, that's OK for a fully charged battery condition.....
A better (quick) test is to check you battery voltage after the car has sat for an hour or so - a fully charged battery should indicate 12.6v. Now start the car for a few minutes and check the voltage again @ idle which should indicate your 13.6 v. Increase the revs to +/- 2,000rpm and see if the voltage rises to +/- 14.0v to 14.5v, steadily dropping as the battery reaches a fully charged state.
A fully charged battery will show only about 13.5v charge from the alternator but a low charged battery will show over 14v from the alternator.
Alternators will whine when under load and rumble when the bearings are worn.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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