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NEVER disconnect the battery with the engine running...
To check the alternator output, simply connect your MM across the battery terminals:
Engine / accessories off = 12.6v fully charged battery.
ditto 12.3v = half charged battery.
Engine running @ 1000rpm MM should read 13.5 - 14.5v depending on battery state of charge.
Anything less than ~ 13.0v suspect the alternator.
To sympathetically fully charge your battery, hook it up the the charger for at least 6-8 hours - preferably overnight @ ~ 2 amp trickle charge.
To check for parasitic draw, as per san rensho says above.
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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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